Well, it's cheap... Doesn't look like it accepts VGA input though, meaning you'll be stuck with composite (RCA) input. I have a feeling quality won't be too great on it.
Also, 1034 x 234 pixles? I'm guessing that's native resolution of the LCD, and with that vertical resolution, you won't be getting much done.
I would suggest checking out the 7" Touchscreen Lilliputs here at the MP3car store, Zip-Lock is great to buy from. I bought my lilliput from him, great service, etc.
Over all,that LCD doesn't look like it's too high quality, and I would go with something a little more well known and used by carputer guys. That's just my opinion, though