I bought a few of the t.bone IEM 75's about 6 months ago now and I'm absolutely delighted with them!
They were originally bought for practice, so that a band could rehearse without using a PA system for which they worked like a charm. I have even used them for a few gigs for which they gave me no hassle.
The quality of the ear plugs arent amazing, they kind of sound like they are missing a bit of the top end, but they are really loud. As for the overall sound quality, not 100% clear, there always seems to be a slight hiss, especially if the volume of the sound going into the broadcast box is low, but i didn't find this to be a huge issue, they are definetely usable and are definetwly worth €100. We had three of them running at the same time in a very small room and had no problems with interference on different channels. The batteries last a few hours in the receiver, the screen flashes red when the battery is low then you have anything up to an hour before they go completely. The broadcast box feels really sturdy as its made of metal. The receiver on the other hand feels a bit flimsy, especially the little antenna, but as with all things if you take good care of it it won't break. I was pleasantly surprised with the range of them - I had to use the restroom while in a rehearsal studio one day which was a good 200 meters away from the broadcast box and down a few flights of stairs, to my amazement I could still hear my band rehearsing the whole time I was gone.
All in all... very happy with these.