I have the target brand bike pants ones and Dr Rei shapewear underwear one which basically goes up to your boobs. I definitely think they do the job and it does make a difference, makes it all smooth as opposed to rolls IYKWIM?

I do have a couple of "problems" with both styles tho. The bike pants ones really really really cut into your thighs to the point it can make it uncomfortable, I thought I was the only one with this problem but a few other women I know have also complained about this too. With the underwear ones I find that they can start to creep down from the top, meaning that you feel like you are always having to hitch them up which also means it can make it appear like you have "backfat". It is almost like you need a couple of hooks to hook them up to your bra, almost like stockings.

HTH