Great start.
The scope holds collimation very well. I haven't recollimated mine for years.
Focus is very easy with a Bahtinov mask. I just added a simple motor focusser to assist. These are cheap and fit perfectly
http://www.myastroshop.com.au/produc...sp?id=MAS-051A
My Bahtinov mask is home made from a piece of 3mm foam board.
All adds up to a great imaging scope.
The vixen focal reducer seems to be quite finnicky about the image plane distance. With no focal reducer the image plane is perfectly flat. When I introduced a focal reducer it seemed to introduce a little curvature resulting in elongated stars at the corners of the image. I experimented a bit with the distance but didn't find the perfect diatance. I currently don't bother with the focal reducer but this is because I cant reach focus with it in place using my SBIG camera with a filter wheel and an AO unit. It's just too long.