Go for it!
These are great, highly underrated guns. I have a 5906 with the square triggerguard and I couldn't be more pleased. I shot about 300 rds. thru it without a hitch, but just to be sure, I polished the feedramp with my dremel to a mirror shine and threw in some extra power wolff springs into the mags. Voila! Shot 400 more rounds, and the same boring thing: No malfunctions. By the way, the high caps are one of the few factory highcaps out there that you can get pretty cheap. I like the fact that these guns are on the heavier side as it soaks up the mild recoil of the 9mm and makes a good thing even better. Heck, I spent good coin trying to make my G19 heavier what with those heavy guiderods. Two more points: that mag disconnect has saved officers lives and that's not some jive made up by the S&W folk. As for the safety going the wrong way? Well if you dedicate yourself to really learning the manual of arms on a piece, you'll be golden. If it conflicts with the manual of arms of another piece, the choices left to you are this:
1)incorporate the new manual of arms with diligent effort
2)write bad press about it, and never take the time to learn it
3)shrug your shoulders and toss the piece over your shoulder, staying with the one you have.
-paco