I've been using Zaino for almost 10 years... It is still one of the main go-to products that I use. I have, as I stated, been impressed with BFWD and it seems to do an excellent job.
At the time I started using Zaino, I had never seen any sealant that even came close. I used Klasse a few times and found Zaino to be slightly better for my purposes. I'm sure Blackfire will stand the test of time, but I have only used it a few times.
I'd recommend any of the three (Zaino, Blackfire, Klasse) on silver.:wink: