There are two keyboards for the Microsoft Surface: "Touch", which feels like a slim layer of felt, and "Type", which has a hard plastic feel and is far closer to a real keyboard. Both keyboards snap neatly onto the Microsoft Surface using strong magnets that click the keyboard neatly into place.
This "Touch" cover has a soft texture to it, and feels like felt: the keys are raised indentations and I find myself making mistakes far more often because I can't keep my fingers perfectly positioned to hit the dead-center of each key. Something abou the gaps between the keys is what I think reduces my accuracy. I've been using the felt keyboard on a very regular basis for weeks now and I still can't adapt to it. The "Type" keyboard costs just a bit more. It is plastic, each key clicks when you tap it, and although the shallow depth of the Type cover can't give you the same spring-back that a normal PC keyboard will, it's still much better for any prolonged typing than the "Touch" keyboard.
I take a lot of notes and do a lot of typing on my Surface Pro. Having used both products, I find that the "Touch" keyboard takes a lot of time and patience to adapt to. I tend to type much slower, while using the hard-plastic "Type" was a more natural transition.
If you're only going to use the snap-on keyboard occasionally, such as to type a password and then move on to surfing/reading, then it won't make much of a difference to you. But for any serious typist, the 'Type' is a must-have on the Surface and the "Touch" falls short of the mark.