Do you manually enter the volume and channel programming into it?
If so, that's what I'm looking for. I have the Axxess ASWC-1 and I'm having issues with it on my Sony XAV-602BT radio. The steering wheel controls sometimes work, and sometimes do not work. Seems to depend on the temperature outside. Works great in the morning but stops working as the day heats up.
Crutchfield is sending me a replacement ASWC-1 as I'm typing this, but if it still doesn't work, I will probably buy this one from you. I should know my answer by early next week.
I also have these items for sale, if you'd like to trade for something of somewhat equal value:
http://gmtnation.com/forums/threads/stuff-for-sale-2003-envoy.16481/
http://gmtnation.com/forums/threads/stuff-for-sale-part-2-03-envoy.16496/