I work for a small airline with just under 4000 pilots and to the last pilot we've had nothing but problems with our Surface pro 3's. It may be the Jepesen app. but the thing freezes up and crashes multiple times per day. The pilots who (unofficially) flew with iPads previously swear by them. The battery on the Surface is WILDLY unpredictable with run times that will magically dwindle before your eyes. I use my Surface only for Jepesen charts and company manuals with battery saver on and all background apps closed. I would never buy one.
DT