A few days ago I bought a 2006 AE garage Queen. I've put only a few hundred miles on it. The bad of it, is starting out. In first gear at a stop, the electo clutch is disengaged, and you have to rev the motor to engage it, It's not that easy to get smooth, but I'm leaning how to do that, and there are some slipper revs involved. I also miss being able to glide with the clutch disengaged, like when you not sure if the next light is just about to go green. Because you can't glide, if you take your hand off the throttle you get some engine braking, not a big deal in 4th or 5th.
The good is that shifting once moving is effortless and smooth, and does not require any wrist. Also when you are stopped at say a light, you don't have to hold the clutch in (being in neutral on a conventional shifter makes it harder to go jump to your pre calculated safe spot. given an emergency to avoid being rear ended. With the AE just rev and go. So far, I think the tradeoffs are nearly equal. Of course, I only ride for fun these days, and I have no need to set any drag race records or smoke other bikers.
In just the few hundred miles I had a mechanical issue with the AE shift. When I shifted up with the foot shifter (I don't think I'm every going to use that crazy hand stuff) it stayed up and didn't fall back down. So when I went to shift up nothing happened, but I could shift back down. When you shift up with the foot the lever falls back down on it's own, and you can feel it touch the boot. So, once I figured this out, I wiggled the shift with my boot when it was stuck up and it came back down. Yesterday, wanting to go riding (heck it's a new toy!), I just sprayed some WD40 under the cover and it hasn't happened since. But this is a good thing to note when you are riding it, that the foot shifter gives you some feedback of returning to the active shift position. This feedback is kind of cool cause the darn thing shifts so smoothly you can't really feel anything, and with earplugs in I can't hear the rev changes so well.
Before I bought this bike I thought about the extra complexity, but heck if I was worried about that I'd still be banging out the back roads on my highly modified Suzuki Savage (a vintage 1950 experience). Yamaha has some great engineers, trust them!