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Before you buy anything, let me ask...What is it you want to see/do?
I have a set of the Denk (Big Easy) Binoviewers...and I like them a lot.
For use on the moon and planets (bright things) I think they are the bees knees.
However, for faint fuzzies I much prefer mono-view...While I suspects that big aperture scopes would be better than what I've got, I've found that DSOs are dimmer...I mostly use my 8 inch reflector dob with the Binos or the ED80.
Yes, viewing with two eyes is very comfortable and I do seem to pick out more detail in what I am looking at...is seeing more detail a function of using two eyes, looking longer (because it is comfortable) or some other mechanism I don't know...but I do enjoy it.
With the DSO stuff I've not found the same benefits as the bright objects...I am happy to concede that it may just be me.
With respect to the quality of the Andrews Binoviewers, I don't know as I've never used them...I suspect that they would be okay but not great.
Remember that with Binoviewers you are putting more stuff in the optical train...any decrease in quality along the way will degrade the final image.
I have read widely that some of the cheaper Binos suffer from measurable differences in the splitting of light and than some are brighter in one eye/side than the other...maybe your brain corects for this, I don't know...
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