They look really cool and I'm thinking about getting either a school of those or neon tetras. Although I've never had much luck with neon tetras.
I've found CPDs to be very hardy. I got mine both at a LFS and ordering online; none DOA even though they came across the country and we're having a rather cold winter here.
I've never had much luck with neons either. If you did the CPDs what else would you have in the tank?