I have used a different brand and type of waist trainer in the past (one with Velcro) so I thought this would be a good brand to try the hook and eye waist trainer. I did not measure myself to compare to the chart so it was more of a Hail Mary purchase. For comparison, I am 52, 173 lbs, 38D and a size 12 in pants. I ordered the medium. First impressions:

 Horrible smell right out of the package. I left it out overnight and for the most part felt like the smell disappeared but while wearing it, I get a slight stench of that weird rubber smell. Im just hoping its not obvious to anyone else.
 Short length. I by no means have a long torso and yet I feel this waist trainer does not cover the same space as in the pictures. To avoid the horrible roll effect on top, I positioned it under my bra as shown in the photo but then feel like it doesnt make it down far enough. It could be at least 1 inch longer. Photo is very misleading.
 Size fits well overall but I feel some pinching from the boning on the top and bottom. I was able to get on the first hook (the one closest to the outside) with some work but it stretches and does not cause bulges. It really does smooth me out and looks very discrete under my shirt. Unfortunately, it is not very comfortable. The boning does not reach from top to bottom and where there is space between the boning and the bottom stitching, it rolls up. I could also feel the boning digging in the top when I sit down.
 The hooks do feel strong and are big. It made it easier to get on as I squeezed myself in.

Tip: This may be common knowledge but I learned that the best way to put it on is in front of the mirror and hook starting from the top to avoid the muffin top effect with the back fat.

I don't know if it is worth the price tag or if this is the right one for me but I may just keep it.