Used Menguin for my groomsmen and me (groom). Overall, pretty satisfied. The wedding etc. was in a remote location, but they had the suits to us several days prior, and for those of us they didn't fit, Menguin sent replacements in enough time f...or the event.
Two carps (one that's shared culpability b/n me and Menguin, and one a caveat):
1. My first and second jacket didn't fit well. Partly, I mistook myself for muscular (per my wife, untrue); partly, though, the customer service rep was so eager to get me a better fitting jacket that we didn't go over that characteristic.
2. If you're in a remote location, the one-day shipping turns into two. Just be aware.
TL;DR: they're a very helpful service, but sometimes to the point of omitting details. Make sure you know your size very well.