Overall I am very happy with this unit. It allows playback of a wide variety of music and video formats as well as receiving input from a variety of sources such as SD cards, flash drives, discs, HD radio, etc. I wish I could get a home system this compact with the amazing functionality it provides.

As to limitations, it does not allow you to browse directories to find the folder which you want to play from either disc, SD or whatever. You can only step through each folder, in order, to reach the one you want. Also, the unit can be finiky regarding how you shut it down and turn it back on. If you just shut your car off with the unit playing, it may not read the media which you were listening to when you shut it down. Also, often when you shut down this way on restarting the car the touch screen may or may not respond. In order to keep the unit functioning properly you must shut the unit off (waiting for the red 'standby' light to come on) before turning the car off. It is a lot like properly rebooting a pc.

Despite these quirks, i am generally very happy with it. Also, it has a great capacity for expandability