I only have one straight PMAG 20 after I had failures to feed during rapid fire in a match. They were cool looking and that was it. Now I realize that since Magpul stopped making them they go for about $20 now. I got them for $12 new when they were made. With that said, here's the reason why MagPul stopped making them straight:
Direct quote from MagPul: "Guys, based on thousands upon thousands of rounds of testing, high speed video, and a laundry list of related variables that just do not allow themselves to be properly addressed in a straight 20 round mag, we will not do another straight. We like our customers too much, and we want you to have the best possible reliability, which you cannot get in a straight body 5.56 mag. Now...yes, there are "reliable" straights, but, when you put them up against the GEN M3 curved 20, it's not even close in MRBF. You'd never notice this though, if you weren't firing tens of thousands of rounds and recording exactly what happens. Is it only the difference of a handful of stoppages per 5,000 rounds? Yep, but it would suck if those happened at a critical moment. Failures to feed in the GEN M3 line have been reduced to statistical insignificance, and we want you to have that unwaivering reliability above any other feature."
So why do any of you still like them?