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I usually get around 0.6" RMS on my AZ-EQ6 (4" doublet, 570 mm fl, 1.33 arcsec per pixel, 3 nm filters) and such performance results in slightly elongated stars. Occasionally tracking error gets as low as 0.4" RMS and then I get perfectly round nice stars. Unfortunately, sometimes tracking gets worse, and subs with more than 0.8" RMS need to be thrown out.
I have been looking at future upgrades, including SX active optics, MDA encoder and also a more expensive mount, including MYT and Mach1. If new G11 consistently performs better than my current mount, then that would be truly great news and I would be seriously interested, after collecting sufficient funds...
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