I've had a colony of lobsters for about 10 months. Adults are a good meal for most adult mantids, maybe not the smaller species.
Pros: Extremely low maitenance, breed very readily, grow rapidly, eat everything, good size for all ages of mantids (except hatchlings of small species).
Cons: Very quick, can climb glass, smell a tad funky when you grab them, for the reasons above...if they infest your house God help you
PS use vaseline on the top 3" of the container