I love this machine- I spent the past year or so experimenting with different RF devices and also in salon- done morpheus, forma, thermage-- so I know a thing or two about these. I used to have a tripolar RF device to use at home and although I loved it, it broke so that's why I bought the mlay. the tripolar had an immediate nip in effect- if I used it two session the same day, my belly would be flat. over a long period of time I saw some minor improvements in skin quality but I still had some laxity and crepey-ness on the top layer. but I loved how it looked after I used it immediately and the next day it was even better. initially I was worried with the mlay because it is bipolar, and when I first used it I saw no tightening effect at all. the next day it did look better and I think that it is due to the bipolar effect which is targeted more towards the top layer of skin while the tripolar is more for the lower layers and fat. I think this machine is strong- just a little less than in salon devices - and what this one does is it initially destroys collagen so your skin might look a little saggier the first day after use, but after a day it will start to tighten and tone. so I think that bipolar is actually better for people who just want to address the top layers of skin but I bet that using this on level 3 will also burn fat because it is quite strong! I like also that this machine you have to plug in instead of charge, that's what damaged my last device and it never had enough battery life for all the areas I wanted to use it for. I just wish that this device had places to store the heads in the machine itself, would make it way better!