I just purchased one and was searching google to try to see other's experiences. I've only used it twice so far. While I haven't seen any results so far except for that temporary plumpness, I'm holding out hope it reduces the ( ) around my mouth. I did notice some other things though - I don't wake up with eye bags, and it makes me VERY sleepy if I use it at night (believe me with issues of insomnia, this is a bonus). I also noticed that my back pain - which recently went out after I slipped on a wet floor) - was lessened. While I was using it, after and the next day (until I push myself too hard). Which made me think that it has some kind of reflexology benefits?
Oh, and I did notice that after just using it once on above eye area (those hoods we get when we hit 40ish), that it reduced that alot. That area swelling is probably more due to poor circulation (fluid buildup) so I think the heat may have improved circulation and moved that fluid. Only thing is, that area is pretty sensitive to heat, so I found it kind of uncomfortable to use it there.
ETA: While looking up squalane oil, I think some of the mysterious improvement in my back pain might be due to the benefits of squalane oil - which supposedly can have a positive effect on joint pain. Go figure - I just rubbed it right on my back to see what happens.