I mix a lot of bands that travel with IEM kits. I'd rather deal with IEM than some shitty monitors at a small venue - if they have half-decent buds you're both eliminating room and technical complications/limitations as well as opening up the stereo spectrum to help with getting the best monitor mix possible. IEM for drummers is very common - and if you either have a reliable touring engineer or playing venues with half decent house engineers then you shouldn't have any problems. It can be expensive to get up and running if you're wanting to get a wireless IEM kit but having said that, being a drummer, you can very easily go wired. Have a look at the Radial H-Amp - takes NL4 speaker level and outputs to headphone level. The only other thing you may want to consider is some sort of protection circuit - I know Ultimate Ears offer a little in-line limiter system with their buds - just as a precaution.