We had a project with them back in 2003. Great price, great services, packaging was great, very quick turnaround, etc.
The ONLY complaint I have is that the finished CDs all sounded noticeably different than the master we sent. I made two masters at the same time -- sent one to DiscMakers and kept the other as a back up. I believe they make a glass master to dup from.
A few months later, I unwrapped a few of the DiscMakers CDs and compared them to my master back up copy. The back up master copy sounded noticeably "clearer" than the copies. If I were to guess, it sounded to me like something to do with the D/A converters.
I don't think it's something anyone else would really notice, but it was obvious to all our ears when comparing the copies to the master.