I got it last Friday. First impressions are very positive. First rate fit and finish on everything. Should have it to the range and first match this week. This is probably my 8th or 9th 2011, everything from old school STI Edge/Eagles, custom Triangles, the newer Staccatos and also have a Prodigy in the safe. This is among the highest build quality.
The S2 is certainly the most aggressive grip I've ever felt, but I really like it. Hasn't drawn blood dry firing or anything like that yet. Looking closely at it, I do think you could lightly deburr it to make it slightly more comfortable.
I still don't think a 9mm 2011 needs a steel grip or even an aluminum grip to keep up, but my mind is open on that... most of my USPSA experience is with a modified STI Edge in Limited Major/40 cal.