Yes, we are a 5 piece band and all of us sing, so we have 4 mics stage front and one for the drummer. As such we use 3 of these, two between each of the front mics and one for the drummer, as such they aren't mounted on the vocal mic stands, they sit on there on stands. Which makes it easier to turn and angle,as required.
I find that they are easier to hear being closer to my head and don't have to be that loud to be heard over the drum kit and amps. Having personal volume and eq controls to hand is useful too rather than having to signal to the soundman to adjust.
Our drummer loves it too. In a cramped stage it can be awkward to place a regular monitor. Also being on the floor, it hey can be hard to hear over the drums which are higher up (small bar bands don't always have the luxury of side filling drum monitors!). Having the monitor high up on a stand pointing at his head is so much easier to hear. He's a pretty good lead singer but sometimes struggles pitching harmonies when required, so this has proven invaluable.