I switched to 11 speed when it first became available in late '08. I've got it on three bikes. The only problem with the new ultrashift ergo levers is the possibility of cable friction fouling up the shifts to smaller cogs. You must use Campy's ultra low friction cable housing or some other 4mm housing with similar properties. I've managed to get Shimano housing to work.

A few brands of hubs or wheels don't work properly with 11 speed, even though they work with 10 speed. Campy hubs and wheels work with 10 or 11 speed. I've had no problems with Ksyrium SLs or powertap hubs. Some DTs hubs have problems.

I chose to buy Record groups with Chorus cassettes, since SR offers very little for the extra $$$. The only part that may be worth the cost is the crankset that has the CULT ceramic bearings. The rest of the parts have trivial amounts of additional carbon or a Ti bolt here or there that saves a few grams. The Ti cogs on Record and SR cassettes will last about half as long as Chorus steel cogs and cost a lot more.