The Vixen GP mount I own gives very good result,unguided-up to 3 minutes.
My new Vixen GPD2 also is very good,with guiding.
The Vixen Sphinx is not good for AP,a friend has one,but uses it mainly for visual-not recommended for AP.the star book is also not the best for AP.Its a shame Vixen no longer have the SS2K for sale,I picked up a 2nd hand one and put it on the GPD2,its very useful,and seems to be built to a finer standard to the 'Skywatcher' gear.
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