FWIW, as with many items you often hear the bad reviews because people who are happy rarely go out of their way to post about good experiences.
Personally, I've used the Scottevest products for years and have never had any problem getting things replaced under warranty. I wear a qzip or performance tshirt from Scottevest every day, and haven't had to retire a single shirt yet. Well, maybe one or two... but that was because I burned holes in them by accident being near cigar smokers.