I remember going to a few stores when they had some of their net books/notebooks on shelves that were not easily seen from a counter. Most of the time you would be able to mess around with them and see how they feel. They were not connected to the Internet and password protected from changes. Of course a few found ways to screw them up, but for myself I was just interested in seeing how big the screens were, keyboard feel, etc, and was not really interested in seeing the windows system which I had already used and knew. Strictly hardware stalking! lol.
For tablets I would definitely want to give it a really good workout by seeing how heavy it is, ease of use, software, see how web pages looked in different screen modes. Not being able to do this would be a bummer for sure.
I went to an Apple store a few years ago and I was impressed with being able to do hands on checks with all of their products and having a staff that knew what I was talking about when asking questions about the product. Had good experiences in Best Buy at times, but they are good for checking out products and then going online to buy cheaper. Now they have a price match guarantee with many other retailers, especially online. A nice option if it works out, but first and foremost, many people I know need to check and physically see the products before thinking about buying.
I hope Staples steps up the Surface display and availability. I really believe that for those looking for something different, or are not Apple and Android fans, would really like the Surface.