We have had them for about 10 months. I agree with everything above. They are great feeders for balls. I too have a few balls that would not eat on a reg basis that eat weekly for me now. I found, you need to feed them live to your snakes. If you kill them before feeding the snakes could care less about them.
They are fun to watch, we have one that has short ears and we found his children have short ears and stubby tails. We are playing with this morph to see what else we can get.
BTW, we use long tongs to take the pinks and fuzzes to feed our smaller snakes. The adult rats will attack you if you don't.