They are VERY reputable!!!!
old thread, but i stand by beljwl, i didn't have a problem with selling a bag to them directly. i know i could have received more if i sold it myself, i just needed the $$ right away.
walking in the store is a plus, DH took the bag to them directly and they gave him a check on the spot. No problems with any "funding" issue. the check cleared within days.