Meguiar's, Mother's, Black Magic - all good quality clay bars and you'd be hard pressed to tell the difference with any of them. You just don't want to use an aggressive pro level clay unless you have an extremely bad finish and plan on doing some machine polishing afterward. Good news is you won't find these in your average auto parts stores so there's no risk of accidentaly grabbing the wrong stuff.

As for the ICE Liquid Clay Bar - don't waste your time. They took a very simple and highly effective process and made it a messy, complicated, less effective process. Stick with the real thing.