I owned the older, blue-tubed version with collimatable lens cell and rack and pinion focuser. I imagine my comments will equally apply the latest version. Regarding the differences, in my experience, refractors keep collimation very well, so the lack of collimation shouldn't be a problem, and a crayford focuser in the latest version is very welcome addition indeed. The rack and pinion focuser on my one left something to be desired...
Optically, I found this a fantastic instrument which controls CA well. Of course, being achromatic, there is some blue fringing if you push the magnification on high-contrast objects. It does not take too much from the view, and can be filtered out if you feel the need.
One thing to be very aware of before you buy is that it is a very substantial telescope - long, heavy and cumbersome. It will certainly need a heavy duty mount - an EQ5 very minimum, and a tall tripod.
