Klasse all in one is not a wax or sealant and it's protection is minimal.
There is no one wax or sealant. Waxes give the best shine, sealants give the longest protection. Typically the harder it is to remove, the longer it lasts. Howveer, as noted, there are good products that can get onto plastic parts and not discolor them. And good products that apply easily.
Klasse sealant glaze is amazing, but it takes a lot of experience to apply and remove it right...otherwise it's a pain in the butt.
Griots show liquid wax is easy to use and remove, has a great shine, and lasts a fe months.
I drive 20k miles a year or more and have a black car. I use sealant glaze in the spring after a clay and polish job. A few months later I top it with a good griots wax. I care about protection mostly, shine second.
If I had a silver car or other light metallic, focus my efforts on sealants only twice or three times per year.
If I drove in low dust conditions and only drove 10k miles a year, I might do 5x per year wax jobs with only carnauba for great shine.
See what I mean....no one way for all peopel
F80 m3 - 20k miles as of April 2015....08 535xit - 120k miles