I have the siphon cabinet, works fine. Occasionally you have to re-filter the sand and clean the nozzle.
As your assembling it caulk all the seams, the gasket stuff they give you will not seal it.
You can also get a variable speed control for a few bucks to hook up the shop vacuum, no need to run it full force.
Also the little inside light is a POS, install some sort of sealed flood light.
Make sure you have some sort of water trap on the air line, and install a ground wire, static build up hurts.