I recently saw a relatively new V-hull boat with a notched transom and Anesons. It had a handling problem. I think that the notch causes you to install them too high, requiring that the drive be run in a down angle to get the propeller into the water. This caused the boat to bow steer and be somewhat difficult to manage.
It would seem to me to not put them on a notched transom boat, however they keep showing up on new boats that way.
Other than that, they are reliable and a good rig.