found a small amount of slop from the 2" nosepiece on the flattener, everything else seems pretty solid.
the flattener has a rotator built into it (very handy!) so ill have to find a rich star field and do some more testing to find out exactly whats going on.
still pretty impressed with the flattener though
you can see what the curvature was like without it here:
http://www.astrobin.com/full/260877/0/
and if i remember correctly the worst of it was cropped out