I love my Alfine 8. I have mine on a Saracen pylon 8 frame with mavic rims and kojak tyres.
Its a great combination for the road, im not as thin as i used to be so i find the bike a bit more comfy to ride. Absolutly no issues with the Alfine hub, i think i get more drag from the disk brakes than the hub.
I use the bike to get out on the road for 20-30 mile runs so couldnt care less about the last few % of efficency.
on the road the 8 speed is fine, all the greas you need. I run out of leg speed at about 25mph which is about where most people are better off just getting in a tuck downhill anyway, on the flat i cant push top gear anyway.
If i was touring i would like a slightly lower gear and the 11 speed would fit that bill better.
Gear chainging is perfect on mine, no issues and being able to change while not pedelling is very handy.
I have a flat bar race bike with a triple chainset and i much prefer riding the Alfine bike, its not quite as fast but just a nicer ride for me anyway.
I would definatly consider an upgrade to the 11 if i could get one at a decent price, right now they are just a bit out of reach.