It works...but I don't think I'd trust it for anything that's load-bearing.
You'll also find that, with a piece of any mass, it takes an amazing amount of heat to get the aluminum up to temperature and a propane torch may struggle.
I got mine at a show someplace; a friend and I split a package. I've still got most of it. The sales guy was soldering soda cans together. It works real well for that!
Try to make a living, not a killing. -- Utah Phillips
Don't believe everything you know. -- Bumper sticker
Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.