Shimano Di2

I gave it a go (LBS had a Parlee equipped tri bike)

The ability to downshift out of a corner (when you have to be on the bullhorns) is, in my mind, worth the $... that's one of the few times I'll ever say a gruppo can legitimately make you faster. Ya know... if you've got the money.

Everything you've read is true... it's awesome. Much better on a tri bike than a road bike IMO.

I test rode one.  It is nice but i don't like the fact that there is no manual override.  if by freak chance that the battery dies or there is a short, you are stuck in the one gear.

There sweet, but i would hate to have a battery issue in the middle of race or just a casual ride. I will stick with manual as long as i can.

I have it on my TT and cross bikes. It's been flawless on both bikes. I do a lot of training and racing in the hills and love being able to shift from the base bar on the TT bike. On the cross bike there's no mud caked cables to worry about, and I have a climbing shifter on the tops.

Whether it's worth the money is a personal choice, but I'm very happy with it.

The battery is a non-issue. A charge lasts for over 1000 miles, and even in big bike mileage weeks my battery charges in less then 30 minutes.

If the derailleurs are hit and knocked out of alignment. You just push a button and it self-aligns. The auto-trim on the front is another great feature.

scott

Scott makes it so tempting....

kind of unrelated, but with something like this, basebars can be useless, except for climbing.

http://www.bikerumor.com/2010/09/26/fsa-unveils-metron-drivetrain-shifters-cranks-cassette-and-carbon-derailleurs/
 

Felt B10 with Di2 is 'only' $5300.  given that the groupo is ~$4K alone, it's a screamin' deal.

Anyway- that's the bike on my "I want" (but don't deserve) list.

yeah, these damn bike companies!

 I thought that the B14 would be all I'd ever need and the whole 'electronic shifting' thing was silly.  Until I saw that you could shift from both locations. 

hmmm. 

+1

If one company can do it, I bet we'll see a ton more like this over the next 12 months. And then Di3 will come out and the other two will have their own version of electric shifters and Di2 will come way down in price and become standard on nice tri bikes.

Apparently even if you do this, the front goes first so you can still finish your ride with the rear.

Some dude on ST is 6+ months on a charge, and he bikes more than 1000 a month.