First impressions after using my new Steppenwolf Tao Light Rohloff with a Hebie Chainglider (the model designed for Speedhubs):
It works like charm! The Chainglider does not cause any detectable resistance when pedalling, neither on the road or in the workshop. You can hear a very slight "swoosh" from the chain gliding against its cover, but this is hardly detectable amidst the noise of the new Speedhub.
I have not tried it in muddy conditions yet, but the chain stays dry after hosing down the bike.
The Chainglider is made of 5 plastic parts which seem to be quite rugged. There are small drain holes on the bottom if you should get any liquids inside it (the largest gap is a few mm where it passes between the sprocket and the hub shell).
The Chainglider is very easy do take off and put on the bike. Mine did not come with an instruction book, but on the first try I was able to take it off in less than one minute on the first try, and reattach it in less time. With some experience I guess it is possible to remove or refit it in 20-30 seconds. The only tricky point is centering the rear part over the sprocket, if this is in the wrong place you'll get a "clacking" sound and the Chainglider will start vibrating (it does not seem to be harmful, but will probably cause excessive wear and some slight resistance). This gets easy after a few tries.
Some pictures of the assembly process are attached below.
The short story: The Chainglider seems to be a very nice addition to any internal hub gear (or single speed) bike. I expect it to reduce the need to clean and relubricate the chain to once every one or the months (or even less?) for a bike used in daily, urban commuter use.