I am happy to report that today's drive in the rain was extremely successful. The Volt hugged the road and rear window visibility was excellent. Rain did not drip onto the seat when opening the driver door. The hatch design allows water to be handled perfectly.
Rain water does tend to gather at the wipers end of travel and streak back just a touch. I plan to use Rain-X for better front windshield visibility.
Wiper pause selections work well. They a got a workout today!