My cars are daily drivers that get driven in the crappy weather of Seattle. I like to wax them periodically for protection but am not the sort of person who is going to spend the time and effort for a show car look. For quite a few years, I have been using Klasse All In One, but I am now experimenting with something different: Meguair's M21 Synthetic Sealant 2.0.
On one car, I used Meguair's cleaner/wax on it first, then applied the sealant. Tomorrow, on the other car, I am just going to apply the sealant. I am going to be interested to see any difference in shine, protection and durability between the two. The sealant is literally wipe on, wait 15 minutes, and then wipe off with a microfiber, so it is pretty easy to apply.