Just tried my new #80 last night. I was expecting it to be more aggressive than it was (by looking at the agressiveness meter on the bottle). I guess I will be picking up some #83 as well.
When people say #80 breaks down fast, they aren't kidding. Very easy to work with and remove though. I tried it on 20 year old single stage paint that has never seen wax in it's life. It wasn't quite enough (duh!) to pull everything out, but it made a 'click & brag' worthy difference.
VV