I just ordered a Kriss Vector carbine in 10mm, and since it takes Glock 20/40 mags, I am debating between which pistol I'd like to pick up. I need to handle a 40. I handled a 20 and liked the gun as much as any Glock, but a 40 I've not seen in the wild.
Plus I already have 5 magazines!
I've never wanted a Glock before, but magazine compatibility makes it a natural choice.