I only have two beefs with the SIG Pro.
1) The danged proprietary accessory rail (with freaking expensive proprietary accessories and batteries).
2) The finger extensions on the mags. I called SIGARMS about getting some of the flush floorplates like they have on the SPC2009 in Europe but the lady didn't know anything about them.
Other than that, I have to disagree with Handy's synopsis of the Pro (it seems like the only thing we agree on is the P7). I personally think that the lines of the Pro are quite nice -- much more so than the ubiquitous Glock that it is competing against. The polymer doesn't feel as "plasticky" as the Glocks, HKs, and Walthers. The trigger is as smooth, if not smoother, than the Classic SIG pistols. Take down isn't as easy or fast as the Classics, but that is a minor point.
The single most common complaint for the Pro is the stiff decocker.
Oh, and there is no comparison with the brick of a Ruger...
...talk about a clunker...