That's funny, my Gen4 Glock 19 has been flawless for over 1000 rounds now (and I've even cleaned it twice! )G.A. Heath wrote: Not entirely true, I'd take the 36 over any Gen4 in 9x19.
To the OP, is it thickness you're worried about with the Glock 30? Proper attire and a good belt/holster combo go a very long way towards concealing a gun.
I can conceal anything from a full size 1911 to my Glock 19 in just shorts and a t shirt.
I've never shot a 36, but two things jump out at me: With a G30, you can use G21 magazines in it. A G36, being the only "slim" design can only use G36 magazines.
In addition, for a little extra thickness, I'd take 10 rounds of .45 in a G30 over 6 rounds of .45 in a G36 any day.
Just my opinion, and as always...probably worth what you paid for it.