Scratch removal before ripping

Has anyone bought one of those tools that you load the CD into and it supposedly removes the scratches from the CD? I found a great store with used CD's that sells the CD's so cheap it's crazy...and they seem to have everything. I've been luck so far that none have been scratched but I'm sure it will happen soon.

So, if anyone has used this does it degrade the sound quality before ripping? I wouldn't think so but figured I would ask first.

Thanks