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Well, Ive been head banging a DSLR for a while, while my mono CCD is away for repair, and the experience was interesting. I found for a given final image quality, the DSLR required a lot more exposure time and fiddling in PS.
I was supprised at the image quality the DSLR rendered in the end, but it was a struggle, for HaRGB at least.
A cooled Astro oneshot cam would be better than a DSLR, both in noise and QE (Qe wise, I think, might be wrong there), but imaging the same object with a CCD and oneshot, I found, in the end, I spent more time overall with exposure time and time in PS with the DSLR than I did with the CCD, and still didnt quite reach the same result.
It is often quoted that a one shot takes less time for exposures than changing filters in a mono CCD, but the longer exposure times required to match image quality of a CCD make the diff mute IMO.
In the end, if your serious, a Mono CCD is a given for many reasons, despite the cost. Oneshots can be an expensive temporary transition.
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