I was going to get a few Menzerna polishes but I have read that they were created mainly fror German ceramics, are they any good on other types of paints too?
They are great on other paints, I think most people on here would probably say the same thing. The two main ones I use are Power Gloss and Power Finish, they are the only thing you need from their polishes if you are a weekend detailer IMO.
The Menz line was originally created for regular paints and then they added ceramic specific polishes a few years ago. I only use the ceramic polishes as they also work great on regular paints. Power Gloss, Power Finish and 85RD for me.
Menzerna PO S100 Power Gloss or Power Finish PO203S along with a suitable pad and PO 85 RD Final Finish will take care of 80% of your paint renovation projects