I also own the 10" Meade ACF and it is a very good visually performing SCT. However, I just purchased one of the C11's on sale from OPT and it arrived today. So I plan to do a few observing sessions using both scopes to see which is the better performer visually.
I wanted a bit more aperture to tease out a little more detail/brightness from galaxies/nebula/globular star clusters, so decided that I would try the C11. If it doesn't beat out the M10, then I will likely return it to OPT within the 30 day return window and pay a 15% restocking fee. They both weigh nearly the same.
I was also considering upgrading to the Meade 12" ACF OTA, but got scared a little due to its' 36-37 pound bare weight. Quite a jump in weight from either the C11 or M10 OTA's.
I am a visual observer only, so I don't use focal reducers.
Bill
-------------------- A Meade 10" ACF OTA on a UA UniStar Deluxe Super 8 altaz mount on a Meade field tripod.
A SV 90TBV fluorite triplet refractor on a UA UniStar Light mount on a UA light surveyor tripod.
Garrett Optical 10x50, 12x60 and 30x100 binoculars.