Glad to hear you think that scosche is the better kit. I got one last week as it was the only one available locally. My wife got the metra kit for her speed3 and while it matches the interior color better, the mounts should have been metal, not plastic. My one complaint about the schosche is that the bezel is too dark but the fitment was spot on.
Also, I agree with you on the volume knob. Why bother when you have steering wheel controls? Admittedly I was very apprehensive about swapping out my RNS315. Yeah, the screen was tiny but everything worked pretty well, the radio was clear and overall the unit was snappy. Its been a bit of an adjustment to move to something else but the sound quality is way better.
What unit do you have? I enjoy my new appradio but my wife got one too but I think she might be better of with something more 'standard'.