I bought one for my G32 and love it. It's not the greatest for concealability because it holds the pistol so far away from your body. That being said if I'm walking my dog at night in my neighborhood I could give a rat's rear if my weapon is so secretly concealed a metal detector wouldn't notice it
One night I watched a drug deal go down right in front of me 2 blocks from my house. I honestly thought about robbing the dealer of his cash to feed my WWII collection (weee CMP here I come) but decided against it in case he too was armed and I actually had to shoot the sorry POS.
The DAY after I bought the holster I had to pull my Glock on a Great Dane I swear was as tall as myself. I had zero time to practice drawing yet I worked that button flawlessly and had the pistol trained on the Dane who was attacking my Airedale. Luckily for him the owners yelled at it and he released my dog and backed away. He came within a second of eating a Speer Gold Dot. To those who are unsure of the button safety doohicky I had ZERO slowdown on the draw very literally the day after I bought the holster. The beauty of it is that when you push the button and remove the pistol your finger is indexed perfectly on the frame of the weapon directly above the trigger guard. At least that's how it worked for me.
Because I had never been in quite a fast paced, OMG this could be bad WTH and I going to do situation before, I was quite pleased with how I reacted. The dog came barreling around an old van and was on top of my dog before I could think to say "Sh__!" I did however, grip the glock so firmly and clumsily while I was removing it from the holster I somehow managed to hit the mag release so as the pistol came out and I was knocked over by the wrestling dogs, the mag was ejected. I wasn't too overly concearned because I figured the 1 in the chamber should stop the threat. If not, well, the other 13 rounds were within arms reach lol.
I do not know if this is part of the holster design but frankly I don't think it was that particular holster design that caused me to accidentally hit the mag release while unholstering. That was probably lack of training.
Anyway, my experience is that I like the holster and its SERPA retention thingy.