Just used some Origin8 Gary OS Sweep bars yesterday which are similar to the Woodchippers.
Guitar Ted Productions: Gary Sweep OS Bars here is info on a long term review of them.

Loved the bars, they felt great on the tops, ramps, hoods, and drops. My wrists felt great after 10mi of gravel and hardpack. I rode most it on the ramps, which even with the bar angled down so the drops are nearly level, was comfortable. The drops are wide, like the wheel of a school bus, but easy to get used to and made steering very stable.

I personally wouldn't consider them for long distance road riding or touring, but that's just me. I love the Nitto B132 Randonneur drop bar for long day rides and more- they sweep up slightly, have a slight flare, and have long ramps.