I have the Rev-Con for it's versatility.
I have a Glock 19 Gen3 with an optics cut third party slide and I was concerned about the fit. I purchased the Rev-Con because of it's versatility for wear options, IWB/OWB, LH or RH draw. But the fact that it accepts optics and suppressor sights was the clincher. Plus it was a great price. If it wasn't made with Kydex (which lasts forever), I'd buy another one today. I might anyway.