The main issue with camera rotators is they are useless near Zenith where the best seeing is. Fifteen degrees either side of Zenith is forbidden territory as the camera is rotating too fast.
When I researched this about 3 years ago, most rotator users gave up in frustration after 12 months and went with a Wedge or an EQ platform instead.
Having accurate flat fields in professional observatories is a real pain in the neck and rotators are just one of those necessary evils. If you take flats, rotate the camera and then divide those flats from one another, it won't be a perfect removal. Unless you have an uncreatably perfect primary and secondary mirror, no flexure of any description whatsoever and onthogonal to within less than a micron, you are going to have different gradients when rotating a camera. Although it isn't likely to be enough to make a noticeable effect on the background as it may indeed look perfectly flat, scientists are trying to get sub milimag precision for photometer if and astrometric studies. I remember reading a paper a while back that mentioned that as much as 3% imprecision caused by the sheer difficulty in getting perfect flats.
