Pmags work great. Finding them is the issue I'm having. I've got a grand total of 2 and I bought out the store (Cabela's in DE and VA Arms in Manassas) both times.
I was at Cabela's in DE. on Saturday, and they had plenty (easily dozens, scattered in various locations) of G-17 PMAGS...I only bought 2 more, so I have 6 now.
$15.99 each, which is only $1 more than JoeBob's, and then no shipping.
They worked great in my G17, my G19 with a magazine spacer, and now work great in my Gen 2 KelTec Sub 2000.
I haven't seen the PMAG 15 rounders yet anywhere, either in person or online. Haven't put a whole lot of effort into it, to be honest.