Anyone sold a Mac on Mac Me and Offer?

Looking to sell one of our old MBPs as we'll buying a new MBP. We have an older device and by far the best offer we got was from Mac Me an Offer. Got a formal written offer via email today along with a mailing label and as the offer was much higher than other offers, including from Apple. just want to know if the company is a good business as I'll be shipping the computer to them.