I bought one to use in my professional studio control room. I had a minor problem with some high-mid reflections off of a side wall in the listening position. This fixed the problem perfectly.
This is a properly designed acoustic diffusor and is very heavy once the relatively simple task of putting it together is completed. The instructions for assembly are very clear and I didn't have any trouble putting it together. Be sure that you mount it well, as again it is VERY heavy.
Considering the weight of the wood and the time it would take to build and cut the individual pieces, this product offers excellent value for money and works well!