I liked it, mostly for the bump in energy it would give me while dieting. As far as fat loss goes, I didn't really notice a whole lot more, but I never really used a whole lot. Started off at 50mcg and went up to 100mcg, but I didn't see much more benefit with the increased dose.
I found ephedrine to be much more effective, mostly because it suppressed appetite.
I didn't taper off, just stopped....didn't really notice any sign of my metabolism being slow.
It's fairly safe and effective for many, give it a try.