I've only just used it once, so I can't comment on the effects of it just yet (I will edit this later on though).
Some cheaper ones have a really strong smell, so I was cautious at first, but this one is all good.
At first it feels a bit odd, but you get used to it after 5 or 10 mins. Supports mid region with weights, but it feels a bit invasive when running, I'm sure I'll get used to it though. You'll be definitely be sweating a lot more with it on, which is good if you make sure you're well hydrated.
When you take it off, expect you and it to be dripping wet - I felt like talking to other people in the locker room about it, but in a men's room, you don't do that sort of thing, it's like a silent code of keeping to yourself.