I had an 8" LX200GPS (prior to the R series) and I loved it. Fantastic little scope for driving around the skies and lookin' at stuff. The only reason I moved away from it was to focus more on imaging and the wedge for the 8" at that time was pretty shoddy to say the least. You can get a decent on now but you will pay nearly as much as a mount for it.
As Mick has pointed out the 12" is definately on the heavy side of portable. Even the 10" is no feather weight but manageable (if you don't have back issues). That is why I liked the 8", nice and easy to setup. Tracking and got never got any complaints from me. It was dead easy to use once you got the hang of the handpaddle. I still use an 8" Meade SCT for imaging and both this one and the last one were great optically. No it isn't a 12" lightbridge but then it doesn't pretend to be.
But if you already have an 8" skywatcher then you will have less contrast with the SCT than with the skywatcher due to the larger secondary. If you are thinking of visual work and like a goto consider a 12" or 16" truss dob with a servo cat to drive it and an argo navis to pilot it. Then get a better mount for you 8" skywatcher and use that for photography.