I can attest to the fact that I haven't had much luck with it either. It was sold as "purple crinkle" at my LFS. It looks great when you put it in the tank, but it has grown VERY slowly, and the new leaves are growing in kind of deformed a bit and not looking like they will ever turn purple like the other leaves when I bought it. A number of the original leaves have since fallen off.
It still looks good overall, but clearly in time eventually it won't. I've had it for about 2-1/2 months now.