Hi plushinred, according to my understanding, FMS is basically cold wrap (for whole body). It can be really cold at times. Some may feel it unbearable. As for AHCTR, it's more for shaping purposes. They will use this suction machine to go over your whole body (arms, back, tummy, hips and thighs).
Not too sure about PBS and BTS, but heard that BTS is more for health treatment, not so much on slimming. As for VS3, it's target on cellulite, making your skin smoother and cellulite less obvious.
Personally, I feel that one should target their treatments on one particular area if you want to see obvious results. For my case, it's about an inch lost within one week. Not so much on the weight lost unless you control your diet. I heed the consultant's advice not to take any carb for dinner and within a week, I lose 1.5kg.