I have sold/traded up two MacBook Pros with PowerMax. In both instances they always found something wrong so that the original quoted price was never what they ended up paying.

They quote you wholesale for your MacBook and then the repairs they quote are retail. So they end up paying less (considerably) than they originally quoted. When I questioned the reduction of the price they never responded. Their bookkeeping also sucks. I ordered a BTO machine and an Elgato Hybrid EyeTV and paid the balance they quoted.

Months later they said they made a mistake and I still owed for the Hybrid EyeTV. I had paid them what they said was the balance so each month when I get their statement it goes into the shredder. Beware