I will never use PowerON for trade-in
I had a horrible experience with PowerON and I think it is nothing but a rip off... to be honest I'm surprised Apple is associated with them.
I wanted to trade in my girlfriends 1.5 year old white macbook for which PowerON initially quoted $255 +/- we were fine with it because we wanted to use the gift card towards a purchase of the 11" MBA for her and since it had some swirls and scuff marks on the outer casing we were really quite ok with the price they offered. I didn't want to deal with "no-shows" on craigslist or deal with eBay and with the holidays around the corner it was a perfect solution.
We sent in the macbook in PowerON box, the macbook had swirls, some scuffs, but overall the machine was in really really good condition. It had a 3 month old power adapter and battery given to us by apple for free (adapter shorted so they replaced battery and the adapter no charge), we upgraded the laptop to 4GB RAM, and I installed a 640GB hard drive I bought on newegg, on top of that it still had valid apple care!!
We received an email from PowerON with their inspection results and I was floored. They re-quoted us for a total of $68 US stating that the computer has a non working touch-pad, and that there were stuck pixels all over the screen, they also mentioned that the computer had excessive wear.
So I asked for the computer back, because I would never accept $68 for a working computer. When the computer returned the touch-pad was working fine, I didn't see any dead pixels, all the swirls and scuff marks from the outside of the case were gone YAY! I guess they thought we'd accept their offer and cleaned it with something that removed the swirls/scuffs. I then looked around on ebay and CL and decided to sell on CL for $575, after negotiating with a first potential buyer I sold the laptop for $525 and I even gave the guy a $40 incase pouch that was never used (GF never took her computer anywhere). We purchased the "ultimate" 11" the same day!
My long story and 2 cents... do a little work, and get what your laptop is worth and forget PowerON.