Very very unprofessional, from reading the other reviews I honestly think that they take your calculator hoping you will forget about. It seems that they won't actually pay you until you get in their face about it. I sent my calculator 2 weeks ago and never heard anything so I gave them a call basically threatening their entire business and suddenly the next day I get my appraisal. Those are some real messed up people they say they give the calculators to inner city youth but they clearly don't have enough respect for people to actually be doing that. I'm 90 percent sure they just take your calculator, clean it up, and sell it for more. Sell your calculator on craigslist, it'll take some extra work but for TI 83 you will most likely get 15-20$ more than what they give you without having to ship anything and wait forever