I bought this in combination with the LD Systems U308 BPG and the LD Systems U500 RK 2, to have my wireless in-ear and guitar wireless both on radio frequency bands and have everything snugly built-in in one 19" rack space. It looks very pretty, and I'm very happy with the limited rack real-estate it takes up.
It is all plastic, but relatively well-constructed. It runs on two AA-batteries and the battery door isn't too flimsy. A little caution around the antennas, goes a long way, and I haven't had any problems with the built-quality of the sender. Okay controls on the unit and the channel selection is easy enough (set on both sender and receiver and you're done).
With only 12 channels to choose from, it does not have a particularly broad range, and I ran into trouble because of that – having to change channels on the fly in a live situation. Both the IEM and the BPG use the same range, so that might be one of the reasons for frequency overlap. The manual is not overly insightful when it comes to the exact frequencies.
The menu is nice and the features are limited, but handy.
The main constraint: I play with another guitar player (+1 IEM and +1 guitar wireless), a bass player (+1 IEM and +1 bass wireless) and a lead vocalist (+1 IEM), so it can become challenging to find some open range.
I bought this as a semi-pro, and it is fairly okay, as it lives up to my expectations, but it is not quite on par with my current requirements. A simple case of "buy nice or buy twice", and I should have invested a little more.
I really like the design and the easy of use, though, so it is an excellent choice as an entry-level wireless IEM. But it is not quite professional enough and I will soon be in the market for something slightly better spec'ed and more rugged.