Ok, had a bash this weekend with them as both wireless IEMs and with my bass. Mixed feelings so far, ace with the bass, nice clean, strong signal, from anywhere in the room, never mind the stage.
As IEMs they're not as good. I'd read that they were quiet and that's exactly what they were. I found I had to turn my aux output up to get the volume required, but that was distorting the input on the transmitting box. So much so that I had to take them out.
Physically, they're fairly robust. They're plastic, but come with a silicone cover which has the belt clip, which is fine around my belt, but might be too weak on just jeans if that makes sense? They come with short jack leads too, which was nice, so youre ready to go out of the box. I'm a pretty careful person, so I can't see me breaking them, but they might not handly being stamped on! I'd say they'd handle gigs no problems, but time will tell.
I'm going to take the advice of other users and get a small aa battery powered preamp to put in my pocket between the receiver and earphones and give them another go. I'll report back next Sunday!