I've been shaving with the HB Sport with Sensor Excel blades for over three years. I've always gotten a great shave. I bought the ATX to try it out. Using it with the HB4 blade gave me a terrible shave. I had to re-lather and shave again with the Sport. I tried it two different mornings with the same results. I then chucked the HB4 blade and put a Sensor Excel on the ATX with the black adapter and got a good shave. So that leads me to believe that I know how to use it, I just think the HB4 blades are not for me. I'm still undecided if I like the Sport or ATX better, both using the Sensor blades.
BTW, I shave in the shower and it takes me about 6 minutes to shave my head and face. And I shave pretty much every morning.