I'm your man for Menzerna. Just back from taking some samples to a lamborghini dealer
I now have many pro and amature detailers that use these polishes with fantastic results.
Certain polishes do have as Rich suggest a steeper learning curve, but some are so very very easy to use. I would reccomend getting a
Menzerna Sampler Kit and throw in a bottle of the Intensive Polish PO85RD 3.01. That way you have the complete range and can find what suits you best. The kit will easily be enough for two cars.
You will probably find by Rotary the only two polishes you need are the RD twins (PO85RD 3.01 and PO85RD) these work perfectly together and are very well lubricated so don't dry like standard polishes.
As a 'one step' product the Final Finish PO106FF is unbeatable really as it has medium cut, full gloss and still the same amount of lube as the other cerami clear ones.
Cheers Tim