I have. The most remarkable thing about shooting the FS2000 is that I can hear a spring humming after every shot.
The ergonomics of the FS2000 are great, and it is lighter than it looks.
The PS90 is more accurate, and, to me, is heavier than it looks.
I like the PS90 better. A piece broke off my FS2000 so I have a prejudice against it.
The triggers are similar, I think the FS2000 might pull a tad farther.
a little off topic but i laugh when people complain of the p90's "long trigger pull" go buy a few double action only pistols and then come back and shoot the p90. Its like a glass rod breaking compared to those pistols.
I have shot both and I own both. They both are show stoppers; anytime I have them out at the range people stop what they are doing and come to drool. I like my FS2000 the best out of the two of them. 8)