I just bought my first IGH bike, a hybrid Spot Brand ACME model. Used for daily 12 mile commuting on lots of bike lanes here in Vancouver. This bike also has the Gates Carbon Beltdrive...a true commuter heaven.

The Afine 11 spd meets all my needs. Ratios are percect for the elevation changes on my daily ride. While I'm not hitting the top speeds I used on on my previous bike (~30 mph down a big hill), I'm not sure I need/want to go that fast. Reduction in gear maintenance, esp. with the belt drive vs greasy chains, is a big plus to me.
I choose my bike based on the fact it was designed around IGH & belt drives...so it's got some very nice to haves...like a rear drop out bracket designed to allow wheel removal/replacement without needs to reset belt/chain tensions
I've had the bike for 1 month now. I'm seeing some occassional gear jumping at random moments. LBS has adjusted shifter cable a bit & I'm now doing test rides to see if it's cured. Apparently Shimano now has a wet weather kit to reduce cable performance issues in the wet...might need to go that route as I ride in many rain soaked days here.