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AFAIK these are the same optically as the Skywatcher/Andrews 70 degree and the astro-tech AF series. The 22mm and shorter focal lengths get good reviews even in fast scopes with some variation between the focal lengths. I did own a 22mm astro-tech which was very good and still own a Skywatcher 17mm which also has good outer field performance at f/5. I only tried them in an f/5 refractor - didn't have a reflector to use.
The astro-tech AF 70 series is aesthetically nicer but the Celestron/Skywatcher is more comfortable to use.
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