I won't be purchasing any Menzerna products, I'm a pretty hard core Meguiar's user. I don't bother with their consumer line at all though, just the pro stuff. I know my 2004 PT Cruiser remains totally swirl free pretty easily and other PTs I've detailed for friends have come out swirl free with ease as well. The Miata I just got rid of had the softest paint I've ever seen - it was like a trained dog: just say "scratch" and it did (or was). But it polished out with minimal effort.

I had to take a rotary to the Crossfire to get rid of some things that the DA just wouldn't budge, and I've never had to use the rotary on the PT. The clear on the Crossfire is definitely harder than the PT but I haven't worked on a CeramiClear MB so I wasn't sure.