since I haven't delved into the world of Zaino, Blackfire or Klasse yet. Probably sometime in the future, I will.
I used Gold Class on my Ranger and it was wonderful! I loved the results, and if my truck was garaged, I would have stuck with it. However, since I am not yet a homeowner and my truck sits outside 24/7, especially with it's first years in the Arizona desert sun and the last 5 in the midwest winters (and salt!).... I wanted something with a bit more durability. Like it was already mentioned, GC only lasts about 2 weeks.
About 3 weeks ago, I switched to Meguiar's #20 Polysealant... and I am amazed with the results. The shine is more of a hard-shell candy-coated look than a deep, wet look, but beautiful nonetheless. Whatever you decide, have fun with it.
BTW: Here's pic of my 94 Ranger with a single coat of Meguiar's Gold Class on it this past May.