I've got Chris' system and could not be more impressed with it. Sounds great, runs grat, and the fabrication quality is top notch.
In fact, I just emailed him last night for another system for my 500 build.
Gold: I asked him last fall why the limited runs and his reply was that he doesn't make enough profit in the units to warrant volume production. Since we "DIY-ers" tend to be a cheap lot, he can't re ally charge what he'd like to make it worthwhile as his primary business appears to be service-oriented.
That said, I'd still recommend his product most highly and will be a repeat customer myself.