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That central obstruction is absolutely huge on these RC's, which will rob you of much needed contrast when observing faint DSOs. The spider vanes also appear to be thicker than those of the GSO dobs, which will introduce contrast robbing diffraction into the view, compounding the effects of the huge CO. If you ever decide to observe planets with these, you'll be losing out big time. The CO of the GSO 10" dobs are around 25% if I recall correctly, compared to 43% for the RC.
If you want to do low power DSO's, it would make more sense to get a dob IMO as you get a shorter focal length which will give a wider FOV, and a much smaller secondary obstruction which will help on contrast of faint objects and planets.
And a 10" dob is much easier on your wallet.
No sense in getting these RCs for visual IMO when you have better options for less money to boot.
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