Don't see to many, but the ones I've fondled have been nice. I haven't had a chance to shoot one yet tho. From the comments I've seen they're nice guns.
With the popularity of the GLocks, the HK USPs, the Walther P99's, The XD's, I wonder why the Sig Pros haven't been at least competitive. My guess is that the Classic line of SIGS (P220, 226, 228 etc) just has such a loyal fan base that the polymer guns may be looked at as a bit blasphemous.