I've have one in my tank for quite awhile.. they potentially could both other inverts I think especially other shrimp, I did lose a cleaner shrimp but I couldn't tell you who the culprit was or if it was something entirely different (like my slacking water changes?), but I also have a few peppermints, numerous hermits, and other CUC and he doesn't seem to bother any of them but does snap at the fish and other guys when he's gathering food.
Mine i am pretty sure is one of these.
http://www.liveaquaria.com/product/prod_display.cfm?c=497+525+2129&pcatid=2129