Wow. This thing is great. Put this in a 2008 Silverado. With this truck if you want to retain the door chimes, warning chimes, etc. you would need something like the Scosche gm22sr or comparable piece, plus a PAC swi steering wheel module to retain steering wheel functions. With the s3-1 and s3-gmlanb adaptor, it's both there. The biggest pro is that you don't have to program anything like you would on a regular steering wheel module. Just select what brand radio you have and everything is pre programmed. Saves A LOT of time. No wires to locate and tap into, no resistors, nothing. Another cool thing is that the module also gives you a lead for reverse gear, parking brake, and even an extra remote turn on. So if you're adding a rearview camera, super easy to install, all from the s3-1. Was a little skeptical at first but this thing worked great and saved tons of time.