Neither of my broken raceplates were transparent, or particularly old for that matter. Over the course of the last week I've ridden TD2s, a TD2 in the front and a TD2 lower with TD3 sole blocks on the back, TD1s, and Sidewinders.
The TD3 blocks made the binding feel considerably stiffer which is what I assume to be a product of the lower stack height and the through-bolt on the bails. SWs with blue all around feels WAY stiffer than my TD2s with yellow pads (though I dont know how much the pads really were doing given that the cant disc had all but completely punched through) but they take the edge off well in bumpy chattery crap like the GS I ran today. I dont think they are the end all binding yet and I feel that the raceplates soaked up bumps way better. Laterally if the sidewinders were any softer I don't think I'd like them, but they dont quite provide enough cush in all directions. My heel is aching like crazy from one particular chatter where I came straight down on the binding and got very little absorption. I want to try yellow rings but I have no idea what that will do to the lateral flex.
I think what makes raceplates soo awesome to ride is that you have a few degrees of slop but the binding bottoms out on the topsheet and provides solid response. I also think that when that happens, you're levering that poor center disc all over the place and that's why the area around the teeth cracks and fails. Sidewinders are good, but I think they need the progressive feel.
I will say I think for freeriding there's probably nothing better than the SW. I can imagine a Coiler AMT or something similar (like the OPs board, but ive never ridden one) with yellows all around would be a friendly, cushy ride with a tremendous lifetime on the bindings. Racers are often on very fresh bindings, not 10 year old raceplates. I know its going to be a LONG time before I start worrying about my SWs. I might like the raceplate ride way better, but after a handful of scary releases, I'll put up with the inferior ride.
Sorry about the horrible prose, I typed this on my phone.