I believe (don't quote me on this) Microsoft is closing in on a billion (1) dollars in annual revenue from Surface. Not sure how much is "profit" but someone who follows earning more closely might be able to clarify.

If the form factor is really that successful, I wonder why no one else is copying it? The Surface itself is made by a Taiwanese company named Pegatron, which is a division of Asus - so it's even being made by an established PC hardware company.