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On average in Light Pollution City, using an FSQ-106ED and an OSC CCD, I am getting anything from 2.5 to 4. Around 2.9 seems usual.
The GPD2 mount delivers absolutely remarkable tracking (EXCEEDINGLY small RMS), so it all comes down to seeing more than anything for me (my exposure time for guiding is now set to 3 seconds). I VERY VERY VERY rarely reject ANY exposures (I will for significant satellite trails or aircraft, but usually never need to for tracking errors). I just have to square the orthogonality to the camera, but will wait until the threaded adapter arrives to see if that fixes it.
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