I really wanted to love this onsie, I really did. Here are the problems:
-It arrived with some sort of dye stains on the front- I was able to wash them out with Oxiclean but was a little disappointed by the lack of QC.
-The legs and arms are skinny, but the middle is very baggy. Picture the grinch. It looks nothing like in the pictures were it fits snugly around the middle. I wouldn't be surprised if they custom made the one in the picture, or altered its visual representation in some way. The legs are also short, with a long torso, so the crotch hangs down. This may be partially due to the fact that I have broad/long shoulders, arms, and legs, but a skinny torso (5'11" and 165lb- medium size ordered).
-The zipper closes the hood, it doesn't stop at the neck like most. This isn't a good design. It causes the heed to have a little point were the ends of the zipper meet and looks like you are a unicorn. It also rubs against your neck,  since the hood doesn't lay open like they show in the picture. Just not a comfortable nor aesthetically pleasing design.
-Its thin- the picture suggests that it is a thicker material, but this is thin (less than 1/8" thick, like long johns) material.

Otherwise, its a decently made article of clothing. It just needs refinement.