So you've eliminated the actual radio completely? I guess if you were looking for the least expensive option to add aux input. Plus it makes for some interesting tinkering. My biggest concern would be no option to change any of the sound settings.

Another option would have been to go with one of these if price was the biggest factor:
Amazon.com : XO Vision XD103 FM and MP3 Stereo Receiver with USB Port and SD Card Slot : Car Electronics

Personally, I'm a bigger fan of USB inputs vs AUX.