I've put hundreds of rounds through mine without a hitch but let yours prove itself to you! It's not a plinker = and it's not made to be one; but I still cycle a couple of magazines through mine every month or so.
Your gunshop friends are poorly informed. Go to visit the seecamp forum for better company!
It is a little picky about ammo - I use wwb Q4255 for practice ammo and silvertips for carry and have never had a problem with mine.