First off, it works. Installation took me about fifteen minutes. I followed the instructions in the badly but accurately written manual. The kit does NOT come with the keys to remove the stereo, which would be nice. I found keys that worked fine on Amazon for $5. My mechanic would have lent me his for free, but he couldn't find where my other mechanic had put them. Using the keys to get the head unit out takes less than a minute.
Everything else needed is included, except the Android app which is a free download from the Play store. I have not used the app yet, but the unit did not recognize and play my Spotify off my phone until I downloaded it. I don't know if that was cause or coincidence. Anyway, it plays Spotify fine now from the aux / headphone jack. The volume out is a little low, but not so low the phone and head unit can't compensate. Sound quality seems fine, in the sense that it's no worse than these consumer electronics usually are. It does not switch automatically between inputs you can have either the usb or the phone hooked up, and have to unhook the other.
It bothers me a lot that this clunky cludge cost $100. A new aftermarket head unit that did the same things would have cost about the same, and I went back and forth on that one. But I like the stock head unit, and I didn't want to go through the hassle and expense of custom wiring harnesses and sorting out the security key. It's nice that you can plug and play this without unplugging the head unit, so the security stuff is not an issue. At the moment I've just got the GROM sitting in the cubby above the radio (my head unit is half height) but I may try to place it more elegantly at some point, perhaps in the dash box. But that will require drilling.
UPDATE: I was able to place the unit under the steering wheel and string the wires down behind the dash from the cubby. It was a little fiddly but easy enough. Had to get a usb extension cord but that was cheap. So now the setup is invisible except for the connecting wires in the cubby. Everything works well.
Sorting it all out I ended up taking the head unit out a couple times, so I'm glad I bought the keys.
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