The role of a car stereo for me is to pump out good audio. It doesn't have a fancy screen or "os" features, but if you just want decent sound with nice relevant features it's a good bet.
Sound quality is great, SD card support understanding folder structures is very nice surprise (get an "industrial" grade sd card and you should be good summer & winter). Decent audio tweak features included as well (sub cross over, eq, etc).
Downside: Display suffers a little from lag.
Not tested: Bluetooth. (I like the SD card support so much I haven't bothered).
A basic good quality audio output device.