Yes, my smasher (N. wennerae) loves the hermits as well, unfortunately that gets to be an expensive meal plan unless you can convince your friends to get rid of their "inappropriate" hermits. I have been feeding mine mysis and frozen formula 1 for about 3 months now and he seems quite happy with the arrangement. Still bashes empty shells around for amusement. He has molted 2 times since I started this feeding regimen and the last time he molted he change color from a dull brown to a vibrant green. Pretty neat.
I feed him every day now, same time that I feed the fish their afternoon meal (the tanks are in my laboratory). Two or three small pieces of whichever I'm feeding seems to satisfy him. I direct feed him with long tweezers and he grabs it right off of them. Sometimes gives the tweezers a real smash for good measure.
Others may weigh in on more appropriate diets for mantis, but my experience has been that these guys are very adaptable, just keep it meaty.