I tried one a couple years ago, was too stiff...…..sent it back. The best suit I've found is the BlackTech Skin, which I believe is actually a triathlon suit. I've worn it in 43 degree water. My hands were frozen, but my body was fine.
I've also tried wearing a neo top, with the arms cut off, over my suit. That helps keep water from getting in the zipper and seems warmer.