How do you feel about the top level controls on the ST-E3-RT?
Hasn't been an issue for me. If I add a fourth Speedlite (or more), it might become so. However, most of the controls for three groups are available on the camera menu. There was one time (shooting with the camera at the top of a tall tripod, where I needed a stool to access the camera controls), that it was challenging to see the hot shoe mounted display. In that instance, I just attached the ST-E3-RT via an OC-E3 cord.
I have been having big issues with the ST-E3-RT screen angle, so much so that I now, like Neuro, use it with an off camera cord. My problem is product work where I am using a tripod with the camera tilted forwards slightly. Anyway the cord is an easy work around and in general use with no tripod the screen angle is no issue at all.
That was the exact situation to which I was referring.