I've just gotten one.
As others have said, it's a bit on the heavy side – but the geometry is spot on for what I wanted (which was the deciding factor over a Kona Honky Inc).
Rack mounts don't play too happily with the disc mount, and I'm not really that impressed by the Shimano discs – better than calliper brakes, but fiddly to set up in a way where they don't rub against the disc when riding and clamp the disc centrally (rather than pushing the disc to one side). They might be swapped for some BB7s at some stage.
Other than that, I've switched forks, bars, tyres, cranks, saddle, seatpost, and levers on a comfort/lightness/kicking about the house/preference basis.
Wheels are going to be changed too.
Yes, I should probably have just looked for a frameset.