I have one of the new GSO 200mm f/4 newts (and also the 8" GSO RC) and I have to say that I agree with most of the comments above.
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4. Contrast would be not as good as with a good refractor, but may be better than an RC as secondary is smaller?
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Theoretically true, but in practice you probably won't notice it for DSO imaging.
The only other point I would add is there is more vignetting on the Newt when compared to the RC.
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Scopes like these are not black box refractors where light goes in one end and a near perfect image comes out the other. You will probably have to spend a lot of time fine tuning and understanding the scope's idiosyncrasies, but when you do get it right, the results can be very satisfying and take only a short time - and the scopes you are looking at are a lot of capability for the money. I am certainly going to keep my f4, even though it can be frustrating at times.
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This is very true. They are both (especially the newt) "projects" rather than finished products. Think: focuser motor, corrector spacing, center spot, reinforcements etc)
If you want a no hassle plug and play experience you will need to pay a lot more for an RCOS / Planewave CDK / Tak etc.
James