I have been searching this site all night for information/thoughts about the .357 sig but can't find much outside of one of DocGKR's stickys.

http://m4carbine.net/showthread.php?t=19887

What I am looking for is more information about the benefits and drawbacks of this round and the performance/availability/function of 9mm conversion barrels (Glock 32 and M&P). I apologize if this has already been discussed. If it has I couldn't find it.