[popo]

I only tried the S types screens on 50D and 5D (mk1). With the 50D, it was a "wow" moment when I stuck on the 50mm f/1.8 and could see the region of focus much more easily than with the standard screen. I didn't use it much though, as at the time I didn't have much by way of fast lenses to use it with.



When I picked up a used 5D, I also got the S screen for it. Unfortunately this was more of a disappointment. The difference over the standard screen didn't seem so noticeable. I'm guessing because the view was bigger, even the regular screen was "improved" over the 50D.



In both cases, I didn't like leaving the S type screen in. I found regular zooms (to f/5.6) to be rather dim even in direct sunlight, forget it in darker areas. As I use zooms most of the time (100-400L over 50% of the time), I left the standard screen in. I'd just rather switch to live view if I need to get critical MF accuracy.