Jill,
We have the KVH Tracvision S2 dome dish. It works okay, but I feel it is slow in locking on the satellite. On our other coach we had the Winegard manual crank-up dish with the digital magic indicator for the elevation. I actually liked the Winegard better than the Tracvision. I was able to set it up and locate the satellite within a couple of minutes at most, sometimes the tracvision takes up to 5 to 10 minutes to locate the satellite.
I have heard a lot of people that have the King Dome really like them, but I don't have any personal experience with them.
Ron