The build quality is good, solid and the housing made of metal is a good feeling. The overall product is in my opinion a bit on the rudimentary side. I know it doesn't have to be fancy as it is functional but it is very rough and ready, clicky, like a toy almost. Changing the 2 AAA batteries is a bit nerve-racking as you have to actually slide open the body pack, revealing the electronics inside. Yikes! It has made me nervous a bit. There's a mono/stereo switch inside the casing also next to the logic board, and it is a bit basic here too.
Sound is solid. Overall there's nothing fancy in this product and the price tag is very attractive for what it is. It does the job, well, but if you need a bit more refinement and probably extra features, like a second output, or a better belt clip, or a "less scary" access to the battery compartment, look somewhere else. If you however are looking for a cheap and cheerful, ready to go simple body pack for your In-ears, this will do a grand job !