I have the 20 rounder for my xd 40. i've been using it for about 10 years now. works ok for the range. has failures to feed once in a while. targets don't care. for the price, it's not a bad deal. don't trust them enough for home defense though
I am not too impressed with Pro-mags. I have bought two for and obsolete pistol (Dreyse) and neither were close enough to the original dimensions to function. Others may have had a better experience, but I consider them junk.
"It is better to be too skeptical then too credulous"