I got one yesterday and, after a little bit of toying around, had it bent to 59-09 and love it (so much so that I traded my 58-04 and 62-07 along with a fairway wood for an SM3 54-14 that I had bent to 53-13).   Talk about stopping the ball on a dime! (it actually stops the ball better than my 62-07 did).   Also does better off tight lies (with a small adjustment to stance) vs the 58-04.

The reason I chose the SM3 vs the SM4 on the 54-14 was the flange is narrower and has a sharper edge (don't mind a little roll and that is the way I play my GW and SW at this point).  My goal is to simplify to AP1 PW, 53-13 and 59-09.   I'm still keeping my 51-09 (50-08 bent 1* weak) and 55-12 (54-11 bent 1* weak) but plan to replace them with the 53-13.  The op-test at the soft bunker and tight lies near the Adm Baker green have proved good so far with the 53-13 (was hitting long and mid length bunker shots). 

Distance gaps aren't really an issue because I am pretty adept at working wedges and don't take a full swing with anything less than a PW unless absolutely necessary.