According to the chart on page 1, my Alfine 8 is less efficient than the Rohloff. But I don’t notice the drag normally, the only time I think its there is if I’m winching up a climb in thick mud/grass etc, it seems to load up excessively but it might just be because I can feel the gears in the hub through the pedals.
My hardtail yoyo’d between Alfine and singlespeed until I settled on singlespeed, the Alfine sat there unloved for a few months and when the drivetrain was knackered on my full sus, I put it on that instead of shelling out for everything.
Works well on the susser with a rear mech as a tensioner, and as a bonus the solid axle has stiffened up the flexy rear end 🙂 I don’t notice the weight/balance, only time I notice is when I remove the wheel by itself 🙂