I have or have used the: Ety ER4, Shure E5, E1, Westone UM2, Superfreq, UE Triple fi10 pro. Of all these, I prefer the UE TF10 because of their balanced sound signature-great bass, good mids, good highs, good power handling capabilities for live sound. The Ety's are great sounding in the mids and highs but lack some warmth in the low end (at least in this application) and though EQ is an option, they will complain if trying to get too much out of them level wise. (Think high levels of live kick drum). They might work excellent for a vocalist or guitarist who may not want as much low end/level as a drummer in their monitors. The Shure E5 has good bottom and power handling but does have an upper frequency rolloff. The E5 can be EQ'd. The Westone UM2 are similar to the Shure E5 with a slightly different sound signature-still good bass and power handling, good mids and, again, a rolled off upper frequency. These are very comfortable due to their use of a small high quality braided cable. The UE TF10 Pro does have fit issues for some people though. There are some different tips available to tweek the system. All of this-my opinion of course so your mileage may vary. I would highly recommend you audition these and others if at all possible before making any judgement.