I have a 10" flex tube Skywatcher dob for observing with family, and something to do while imaging.
I had also agonized over the 10 vs 12 decision, but as soon as I saw the size of then in person, my mind was made up. It's not the weight per se tht's problematic - the sheer size is hard to manoeuvre, and the centre of mass is very awkward being so far in front of your body.
Don't forget to get a decent observing chair. You may also want to think about a dew solution (primary doesn't dew up for me, secondary only under really nasty conditions, eyepieces + finder every time).
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