I have run Lipo, Clen, Albuterol and T3.
I am currently running Clen at the moment on it's own at 200mcgs/day. All of the above do work in combination with a calorie deficient diet and cardio. The best of the bunch for pure fat loss would be clen/t3 stack IMO. There are some sides which are of nuisance value but also some reports of worse sides, cardiac arrhythmia and necrosis so I limit my time on Clen because of this. I have never experienced the cardiac arrhythmia but still better to be safe than sorry.
In fact I am coming off the clen in a few days and then going to start the lipo-amp stack again as clearly this does seem to have some health benefits rather than detriments but when I really want to hit some fat hard then I don't think clen can be beaten.