HOT-ROX is a great addition for fat loss. Fatty Fat is right, insulin spikes do blunt or halt yohimbine. If you are carb cycling, like I am, you should take it on your low days and avoid them on your high days.
Other than that, they are the best smelling supplement I've taken. Well, except for chocolate mint whey powder. That stuff smells like Thin Mints you get from Girl Scouts.