I'm mostly using PayPal and have done so into the mid $x.xxx range. Which doesn't get to say that it's the ultimate service, i just like the convenience of it. I usually wait til the funds have cleared into my bank account and have detailed emails with the buyer acknowledging all details of the transaction, including money sent, domain transfer records, DNS changes, screen shots, etc. Just the usual stuff that goes into my virtual "domains" backup folder. Is it fail safe? not by a long shot, but if you do your homework and document everything, you get a pretty good idea of whether someone is actually going to complete a sale or is going to hit you with a charge back - in which case, you have detailed records that any charge back was a fraud attempt.
IB