Got to think, whilst I love the Rotor set up are the benefits going to outweigh the accommodations made to get it to work. I was always told the simplest engineering solution is the best...
Yes, round chainrings = sensible. Elliptical chainrings = costly marketing kool aid and poor shifting
IMHO the Rotor chainrings have no real effect on cycling speed.
Intuitively and thermodynamically you can't get something for nothing. If you could get something for nothing, people using these rings would win more races than people who don't. But I don't see any significant effect here.
I hear that they do show something like 1% higher power on some powermeters. I think this might be because most power meters assume constant angular velocity when measuring cadence, which is a poor assumption with these rings.
If some people say they 'feel better', then that's great, but it's the placebo effect. Most people would tell me their bike felt stiffer and helped them to sprint faster if I told them I'd provided a 10% stiffer 'special pro Cavendish layup' despite making no changes from standard. Or go cheap and add a shiny bolt to get the same effect.