You'll find about half the bonsai community uses it and swears by it, and the other half doesn't use it and swears at it. As with most things, it seems...
Personally, I've got both the tub stuff that is really thick (don't know the brand), and the thinner tube stuff (kiyonal? or something like that). I prefer the tub stuff when I do use any. Would like to get some of the electricians putty to give that a try but haven't gotten around to it.
Chris