I got the Clarion CZ702. The bluetooth was an unmitigated disaster - phone does not reconnect automatically, audio stutter, forward/back does not work, no title display. Literally everything that works with the factory BT in my Mazdaspeed 3 doesn't work on the Clarion (in another car).
My other use is playing audio from a usb stick. Here, I didn't pay attention and got a unit that doesn't play AAC. My music is FLAC and I keep a copy of everything in lossy AAC for mobile use. Since the Clarion doesn't want that, I'd have to keep yet another copy in mp3.
In actual use, mp3 didn't seem well thought out. You can't see albums or folder names, all you get is folder up/down. Pretty impractical for navigating even a midsize collection. I have about 200 albums I don't want to navigate 200 albums with a folder up/down key.
So, any recommendation for a single DIN unit that does bluetooth and usb audio well? Ideally below $200.