Yes used them in the past, only issues were of a couple of unreadable discs, however there is a reporting system on their site to get this resolved, so it's a case of waiting for a new disc. Other issue was when the trial ended, I got billed for a further month, so you have to time your cancellation right, if you don't want to continue.
I was only renting games from them at the time though.
If you're interested in taking them up I have a code for a 90 day free trial.