I have one and it's a phenomenal RDS, I have approx. 500 rounds through mine and it is very easy to conceal with the low profile. I had a 508T and that thing was huge compared to the SCS.
Actually, they make an enclosed SCS for the P320. I'm sure they are already trying to find a way to do one for other models as well.I like mine so far. I'm still getting used to the lack of a manual brightness adjustment, but at least the auto brightness can be temporarily disabled. You still have the same dot/circle/circle-dot selection like always. I wonder if an enclosed version can be made but I have a feeling that won't be possible due to the screw placement.
I wasn't aware of the enclosed 320 SCS. That's pretty cool! While open emitter isn't a deal breaker for me, it is nice to have.Actually, they make an enclosed SCS for the P320. I'm sure they are already trying to find a way to do one for other models as well.