Great for attaching to the two part styles of guitar straps e.g. Richter Guitar Strap SpringbreakI or a Levys MS26 etc. It wouldn't fit the wider one piece straps, but I don't think that is their aim for this holder.
It is a little on the large size. My Shure GLXD1 sits very loosely in the pouch. If you move about a lot, or put on a bit of a performance with the guitar around a lot, it would most likely slip out of the pouch. The Line 6 Relay TBP12 sits in a better, with the belt clip still attached, but it's still loose. I've managed to get around the looseness issue by wrapping a velcro strap around the transmitter in the pouch.
Other than the size issue, it's good value for money.