Two things really Greg. Framing. You can get exactly the framing you want straight up. I use the Sky and CCDAP to determine the rotation, sometimes it is in decimals of degree, so it is good.
Yes perfect for remote setups. However more importantly is it for going across the meridian. You don't have to rotate images during processing and you can use the exact same guide star each time if you want.
Even a square can do with a rotation.
