Right now I am using a CEM 25 which is managing just about 1.0 arc seconds RMS with my 20 lbs of EdgeHD 8" + reducer + OAG + D5300. For a $900 mount at 75% of it's capacity, I really can't complain!
But I want to get guiding closer to 0.5" RMS, and I'm getting the new ASI6200mm and a filter wheel so I want to do it justice with an upgraded mount.
The CEM 40 is newer, has very similar specs to the CEM60, but is nearly half the weight:
Worm Wheel Φ110mm, 216 teeth
Resolution 0.08 arc seconds
Unguided Accuracy / PE <±7 arcsec
Mount weight 15.8 lb
The CEM 60 has built-in usb ports, more capacity, better specs, and still pretty light for it's capacity:
Worm Wheel Φ146mm, 288 teeth
Resolution 0.06 arc seconds
Unguided Accuracy / PE < ±5 arcsec
Mount weight 27 lb
I'm leaning to the CEM 60, but which would you choose? Anyone getting ~0.5" RMS with a big scope on the CEM 40?