I own ten Glocks, nine of which I shoot fairly regularly. The other one is still sealed in the box. Well, I guess I should say, I used to shoot them all regularly. I have pretty stuck with shooting my G38 lately. I have practiced with the 9mm a bit also, but it doesn't get the blood flowing like 45 does.
As of right now. The only draw back to the 45GAP no matter the make or model, is the availability and price of factory ammunition. You can still find some deals and that is what I did. I have been shopping around on-line and stocked up on some cases. I have paid anywhere from $11 a box to $14 a box after shipping. My plan is to stock up on the brass from this ammo and start reloading my own. The way I see it, ammo prices are only going to keep going up with gas prices being what they are.
Other than that, all my guns in 45GAP(G37, G38, XD-45LE) have been perfect. Manageable recoil, accurate and fun.