From my experience with stick tac brands, most any sticky tacs are the same. Some prefer the name brand Blu-Tac, which I've never tried. I have tried UHU tac (which is great and goes a long way and is quite sticky all the time) and some off-brand blue colored tac, which works well, but isn't quite as sticky unless you knead it before each use.
Of course, all tacs will need lots of kneading for them to work, but from my experience, UHU stays sticky after kneading it a few times (I used to knead my sticky tac a lot, and now, it's just a glob of tac on my desk that doesn't really need to be kneaded).
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