I have resurfaced thousands of discs and never had a return on eBay or a complaint for anyone of them.
I have a RTI eco Autosmart and it works very well.
The success is low on Sega CD, Saturn, and Dreamcast. Everything else is perfect. Gamecube I have found a few tricks and salvaged hundreds of discs.
Cost is 1.00 per disc plus return shipping. You send me the discs I resurface and invoice you turnaround is usually a day or two unless you send me a few hundred discs.
I am sure a lot of you know me but I have a lot of feedback on eBay 25,000+ and had 894 on Nintendo Age same user name on all