I'm typing on the Surface Pro 3 right now as we speak and the keyboard is pretty good.
Also, the complaints about not being able to use this thing on your lap are ridiculous. Sure it's POSSIBLE but it's not great, but with a tablet form factor, WHY WOULD YOU? If I needed to shoot off an email or do some reading and surfing, why would I use this on my lap rather than use the touch screen? No one ever complains about not being able to use an attached keyboard on their lap with an iPad because they don't.
If I wanted to do some serious work, then I would make an effort to find a flat surface or desk to use the keyboard on. You can easily find one at the airport, coffee shop, etc... If I was in a meeting or in an auditorium, press conference, or whatever, that's what the pen is for. Using laptops on your laps is so 2005.