Here's my view, stay far away! Sorry Jon Don! I purchased one trying to save a couple of hundred on my entry level WRD, they honored their warranty and replaced 2 of them. Handles crack from stress because there is no vacumn release. This is a great example of you just need to buy the best! I broke down and ordered the water claw and it is an awesome piece of equipment!
How is the performance? It seems like it would be easy to use a vacuum relief valve near the device so you wouldn't have that problem. That is pretty cheap compared to the others.