I have this unit and it works pretty good. A couple of tips however:
1, seal all of the seams, any kind of caulk on the inside of the seal as you put it together will work.
2, The hardware and hoses are crap. I replaced the hose, nipples and hose barbs and clamps with new parts from HD, that stopped the leaks and breaks
3, Use a GOOD drier, compressed air collects water and it will get into your media and the siphon will stop picking it up
4, the light inside sux, I use a drop light in mine with a florescent bulb.
5, I don't like the way the view plate works so I am going to put it on hinges so that it opens, making it easier to clean and put the plastic shields on, working inside the box is a PITA
If I had it to do again I would get a top loading box, but with some mods this one works ok.
good point, Ive got mine filled with a mix of degreaser , carb cleaner and water, it deffinately will peel off a good deal of crud over about 15 minutes
a sand blast cabinet comes in handy for the heavily layered/rusty crud