I havent used it stand alone but as part of the USP Camphibolic product its seems to work pretty well.
Its not a stim and its not going to shred you in a week but certainly on camp i experience a steady ongoing recomp, many others have observed the same.
I think there was thread around about a beta product using TTA, GT and Camp, i forget... a search should through it up, some studies there as well i think.