Partner has one. None of the competitors or shooters I associate with have one. Played with it a bit in 40S&W.
It's an improvement on the Sigma, but that isn't terribly hard. Trigger pull is still excessive. Trigger reset is fuzzy. My partner had a few reliability issues which might have been the shooter instead of the handgun. I couldn't get it to group worth a darned at any range, mostly due to the trigger pull.
IMHO, most people would be better served with the M&P, Glock or XD. I relegate the SD to a functional but non-hobbiest gun. Even the Walther P99 is much superior.