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At what stage in the process? If you are building CCAs for brassboard prototypes or the final CCA design is still in flux, quality manufacturing is probably a waste of money as you are likely to end up modifying the design and blue-wiring the board anyway. Nobody, including the company, is remotely suggesting that Dirty PCBs is an option for production boards.

A service not in HK will get you your boards faster though, I'd pay 4x to get my boards this week instead of sometime in the next month.

For professional work? Absolutely. For hobbyist or venture work? Less clear.

hobbyist time is considered free. If you are talking about ROI, then you're in a different league.

If you give them files with 20mil trace and space specs is there really that much of a risk?

I was on the OSH Park website a few minutes ago, and I think I will give this a try instead.

I've had good results with OSH Park and 10mil trace / ground plane isolation, FWIW - and they take Eagle 6.5 natively (although depending on third-party library setup you'll probably want gerbers anyway).