I have a few bug-bears with these things.
Concept - excellent, great things to have when you constantly work with changing out bits, components, testing. If they're exactly as you require them.
Prices - absolutely rediculous up to this point. Cheapest one I've broken ** was probably £75 or so, and felt like it. I didn't buy it, so hey.
Essentially, an enthusiast can put one of these together themselves, suprisingly cheaply. If you consider yourself a compitent wc'er and especially a case-modder, the task is simple.
** the breaking usually comes cos although the basic form is there - they don't facilitate 'something' - so you end up modding it in some fashion.
LL tray - $25, salvedged parts from old cases, "hack saw", misc cables from your favorite outlet. Coat it ? I've scratched the heck out of them usually with so much in/out of components. Monkey prints on the LL stuff can be annoying tho.
Meh, each to their own.