I first ordered the Wink Ultimate Bikini Shaper in hopes that it would return me to my pre-pregnancy form quickly after birth.  I packed it in my hospital bag and when it came time to wear it on the way home, managed to some how slip it up and on (bought the one without the zipper).  The top band on the Wink bikini was incredibly tight, while I felt the compression part was not doing very much at keeping me sucked in.  As a result, I could only wear for an hour or so before having incredible back pain without any benefit.  I immediately ordered the Bellefit girdle with zipper, as I had seen very good reviews for it after I had already ordered the Wink but at that point figured I'd try the Wink first.  Got it with one day shipping with my Prime, and put it on.  Despite the fact that it was very tight and held me in really well, it is super comfortable.  The band at the top did not cut off my back or give me any pain.  I started wearing it on day 5 post partum and have worn it every day, and I believe my stomach has definitely gone down more than it would have on its own.  While wearing it too it provides nice back support while nursing and being on my feet.  I am very pleased with my purchase and if I do need to go down a size as I continue to contract I will be happy to spend the money on a second one.

As for sizing, I am 5'8" 160 pre-pregnancy and gained 35 pounds.  I ordered the M in the Bellefit and while it was difficult getting it on the first few times I don't think the Large would have lasted me very long so am glad I ordered the M.  I ordered the XL in the Wink and the sizing is about the same as the Bellefit M.