Opinions on belly bandit or similar products after birth?

Da

I'm in the fence about getting one do these products as I'm not sure if they actually work or are a waste of money. My OB says there's no harm but there's also no scientific proof they work or give you your belly back sooner. If I was gonna get one it would by the upshrinxx as it's only $40. Is anyone else using planning on using one or have used one?