FYI: A Surface Pro has very similar usable disk space to the MacBook Air according to ZDnet. Especially if you move the recovery space to a USB stick.
For more pesky questions to the MS team about Surface pro, read this page or just read an early ZDnet review
FYI 2: People who use Macs, Ipads and Google devices don't seem to develop custom software and just like suffering with what they have been given. Good businesses should continually improve their business practises, standing still or downloading the odd app is unlikely to liberate the information that individuals collect.