Update: I just tried to post and was met with the error that I can only include 2 images per post. I'll include the first two and link to the rest in subsequent posts.
Start-to-finish was ~10 minutes to get everything set up and installed. More on that below.
Unboxing was a great experience: I liked the labeled compartments and organization. The receiver device was not aligned straight within the box - it was fairly diagonal, like this:
(side-note: I love the upload/embed interface here! I just dragged an image in and the post-box took care of the whole thing!)
Before I get into the hardware and software, a note about the documentation: it appears from your website and the box and everything I've seen that your name is "nonda" - yet at the top and bottom of the warranty card, it reads "No NDA inc." It should be consistent everywhere it's your company's name.
The longest portion of the setup was going to the tires and unscrewing the old valve caps and screwing these in. I couldn't use the locking nut, as my valve stems are rigid and there isn't enough space to get the wrench in to tighten the nuts.
-- image 3, see next post --
It'd be amazing if it came with some sort of offset wrench to go around the sensors instead of the flat wrench. Something like this (but likely smaller)?
-- image 4, see next post --
The instructions said it had user-replaceable batteries, so I tried unscrewing one of the sensors to see what battery it took and how much effort it would take to swap the battery when the time comes. I struggled for a few minutes to re-assemble the sensor. It seemed that no matter how many times I tried, the cover would ALWAYS screw on slightly crookedly. Ultimately, I barely started screwing them together, then squeezed the two halves until the threads "clicked" into the correct channels, then screwed it together and it was perfectly aligned. It didn't end up being a major issue, but I was surprised by the difficulty I had and was worried during my attempts that I was going to strip the threads.
It seems that the receiver beeps every time it gets power (when I turn the car on). This is super-annoying and scared my wife when she first started the car and wasn't aware it did that. It has LEDs that indicate status - I'd like to either not have any beeping or have the ability to shut it off.
Overall, the hardware was pretty straightforward - it was straightforward to install and no-nonsense. I have more feedback about the software... In the settings screen, the default name is "Smart Tire Safety Monitor" yet when I click the edit-pencil, it gets truncated to "Smart Tire Safety Mo" - the dialog box should at least support the default name:
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Many times when I start the app (after starting my car and the receiver turns on & beeps), the app reports that one or more (usually either 2 or 4) tires are connected and calibrating. I'm not sure if the calibration is not stored or if it needs to recalibrate each start, but it's not clear why it is calibrating some of the time.
A couple times (when I was no longer in the car, if I recall), I received notifications on my phone that there was a "Leak detected" - this was VERY concerning, as it led me to believe that there was an air leak from my tire. Upon clicking, it seemed to be some sort of leak (memory?) from the app itself. One of the times I clicked it, I was given what looked like stack traces. Applicable screenshots from the app:
-- images 6-11, see next post --
Under the Help and Support menu, the "How ZUS works" link goes to a how-to for the car-locator and has nothing to do with the tire sensors:
-- image 12, see next post --
The "Community" link is totally broken and leads to an "Objedct not found"-screen:
-- image 13, see next post --
I don't remember what triggered it, but at some point, the app asked for more permissions - there wasn't any indication what they were going to be used for, though. It may have followed one of the "Leak detected" alerts, which didn't make any sense to me:
-- image 14, see next post --
Finally, I happened to tap on a tire and discovered a new screen with graphs and info! On the graph screen:
1) The graphs are unclear to me. There are two charts, temp and pressure, but no indication as to which line corresponds to which measurement.
2) I don't know what the "AccurateTemp Trend" is or does. What's the difference between the regular pressure/temperature and the "AccurateTemp(r) Pressure/Temperature"? I can see they're different when you use the "Original" versus the "AccurateTemp," but I don't know what the difference is.
3) At the bottom, it says "Power by nonda Technology Protection System" - if that's actually what you're trying to say, it should read "Powered" instead of simply "Power." Additionally, it's the first time I've seen "Technology Protection System." Is that necessary whatsoever? I'm aware that it's a "nonda" product (or "No NDA?"), so that's unnecessary, but what does "Technology Protection System" mean? Is it a system to protect technology? It is a protection system of technology? Is it the name of the product? Personally, I would remove the entire line, as it seems confusing and unnecessary.
My final feedback about the app: I'm not sure whether I need to have the app launched to collect data or not. It seems to collect some data from some time period when the app is not actively running, but I'm not sure when it collects or what is collected. When I did not launch it for a couple days, it seemed to not have any data about my drives (2 drives for 1 hour each) that had happened in the meantime. This morning, I launched the app at the end of my drive and it had data for about half of the hour I was in the car and driving. There didn't seem to be any consistency, so I am not confident that I will be warned if the tire pressure drops in any tire when the app is not running and I have no idea what the requirements are for it to actually collect data. In an ideal world, either it would always collect data and then do a full sync when I launch the app (what if my wife takes the car and my phone isn't there - will it still work when she's driving?) or there will at least be guidance (in the manual?) as to when it's working or not.
As far as functionality of the sensors, they seem to work just great - I have not manually calibrated them against pressure or temperature of my tires, but I would assume they are accurate. Given that, they seem to update quickly and regularly (while the app is running, at least) and it's awesome to be able to see in realtime what the pressure is of each of my tires.
This felt like a long post, so I'll end it now, but those are my initial impressions. Overall, I love the system, but it feels like there are areas that need a bit of polish.