The ability to ink in OneNote and search on inked text, period. That is the only reason I bought this. I have it connected to an external monitor and run my database on that while I use the SP to take notes, look thinks up, etc. For me the SP isn't the "show" it is the "supporting cast". That's all good, Hamlet needs his Horatio. P.S., I have actually found a reason not to despise the Metro UI. The Yahoo Mail app. Sending emails from Yahoo using the browser interface is a pain. The Metro app is pretty nice.