

Get the battery powered one, and get a 9v 1amp wall wart (it can run on batteries or the wall wart).
Also buy spare sanding wheels, at least 3, preferably 6.
Source: I have one. It takes 2 minutes to do a full pass. One wheel will do about 100 discs before being too worn out.
Of the ~200 unreadable discs I’ve run through it, perhaps 5 were still unreadable afterwards (and those may have had a copy protection failure, I’m not really sure). I do know pretty much all were readable afterwards, when they weren’t readable before.
Edit: the spray is just water with a drop of dish soap. Use lots of water - when I hear it slow down I know it needs more water on the disc, so give it another shot of spray.
The barrier to alternatives is very high, especially when they simply don’t understand the risks.