I bough two of these to fit to guitar straps to use with my Shure T1 wireless guitar transmitter. Although they're intended for Thomann's own t.bone transmitter, they worked perfectly fine, holding the Shure transmitter securely on the guitar strap.
They have a velcro cover on the back that wraps around the guitar strap and a plastic buckle that you can feed a thinner guitar strap through - the vintage type that have a looped leather piece for adjusting the length of the strap. Not everyone uses these straps but it's nice to have another option for securing the holder.
There is plenty of access to the transmitter to allow for antenna, wires and to account for those who prefer to put the transmitter in upside down.
You are getting a great piece of equipment for very little money.
The only downsides I found were:
...that there is no top strap. Although the transmitter seemed secure, I would prefer a little velcro strap over the top to be sure. In fact I made one for mine using a bit of velcro left over from my pedal board. An easy fix that took a matter of seconds. Please remember that this item is intended for Thomann's own t.bone system and that might be even more secure without the need for my 'fix' as I note that there is also a press stud in the holder that might clip onto the t.bone.
...that one of the two I bought was not very well finished - jagged edges on the faux-leather material. I know that Thomann would have changed it, but for the cost I'm happy to live with it
I scored it 4 on quality and features to reflect those points mentioned above. I scored 3 on sound as I had to put something in order to submit the review!
All in all, another fantastic product from Thomann