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Ken,
I haven't had the 10" f4, but had a long and illustrious term with an Astrotech (so GSO) 8" f4 Imaging Newt. It was an awesome sucker of photons.
BUT.......... it needed major titivating to get it to where I felt it should be. Maybe it was just me, but there many deficiencies that stopped it reaching it's full potential.
I ended up utilizing a better focuser, stiffening (severely) the area underneath the focuser attachment, and moving the primary further away from the focuser/secondary.
This coupled with quick adjustment knobs on the secondary, and stiffer springs on the primary, plus removing the silly "adjustment" knobs on the primary rounded out the modifications.
Great scope? Yes indeed, very nice.
Do it again? No, not sure that I would, I found I was constantly collimating. If you can handle this every time you use it requirement, then it is very very good bang for the money. Factor in a coma corrector too, I used the MPCC.
10" should be the same or better, certainly bigger. I already have a 10" f5 newt, in C/F tube.
Gary
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