I'm using physics heels on my raichle 123s. For some reason they don't seem to want to line up just right, but when you tighten the screws down it must flex the boot just right and they go together just fine.
I'm using physics on one board and performance sis on my other board. I had to mess with the performance quite a bit to make them work with the added heel lift, but they're working pretty good now also.