There's the 1200, and the 1200+. I have one of the latter, which I bought primarily for off-roading. For road riding, you might actually be better off with the 800L in the long-throw model if you like being able to see a long way down the road. With the 1200+'s floody beam pattern, to see as far as I'd like on the road, I run it on HIGH, which of course results in the shortest runtimes.
I like the low weight and the compact battery, which fits under my long-ish 120-135mm stems. I don't like the rubber-strap mount very much, but I may pick up Cateye quick-release bar mounts and transfer the head to one of those. In cold weather, it also signals "low battery" rather early, a trait my 600L had as well (but it'll keep running).
So far, mine hasn't had a chance to face serious rain, so no firsthand info on that area yet.