I was eagerly awaiting it, and they're ok when they work. I do find it keeps telling me about some segments I'm not going to be doing, I dismiss them, and then they pop up again a minute later
No good for short segments (<45s) but good for longer ones, I guess.
I found it an absolute ball-ache to get them on. As well as spending several hours trying to get the software upgrade to run (eventually emptying the trash with the Garmin attached seemed to format enough free space to get it to upgrade), I had thought the segments would upload automatically, but no. The link to send them isn't even on the Strava segment widget on the home page of garmin connect, but you have to go to the menu->segments->send to device, which didn't seem to be documented anywhere. (This might have changed now that I look again - that link has now changed, maybe they're just doing it automatically).