Unless I find a durability problem I have to say that I prefer
Blackfire over
Klasse for apperance value. Blackfire topped with
Pinnacle Paste Glaz looked better than Klasse topped with Pinnacle Paste Glaz. I liked the beading of Klasse but after I topped the Blackfire with carnuba the beading came back. The shine and reflection is better with Blackfire. Klasse may be a little eaiser to apply but I still have to say that given a choice I would choose Blackfire. It would be a very close judgment though. I'd rate BF a 10 and Klasse a 9.9.
Meguiar's#20 tends to go a little yellow after time. I use it around the inside of my doors but that's about it. I haven't had a durability problem with it yet. It still seems to be doing what I want it to do and its been over 6 months.
I recently did a test on some sword blades to see if there was a difference I could see between Blackfire, Klasse, and
Meguiar's #20. I'll have to take pics of my findings. So far I think Klasse has protected the best. #20 seems to be harder to clean but the Blackfire is pretty much the same as Klasse. Klasse is a little eaiser to clean but it's a close call. I'll get some pictures so you can see what I mean.