My buddy bought one of those... it sets, largely unused. I'm not necessarily a big fan of the 30's, I think it unlikely I'll ever get a 40... I'll just borrow his! I have about equal amounts of 20rd and 30rd mags... all of my 30's are PMags, I still have 10 USGI (Colt) 20's that I really like, and the 20rd PMags, too. In fact, the first PMag I ever bought was one of the 1st Gen straight body 20rd mags.