I use a mixx 700 and love it but the battery is pants, as it the battery on the surface (according to the folks that I know that have them). It sits up like a laptop with the screen open and works as well as a laptop. The nice thing about the mixx devices is that you can open them and change the drives if they wear out. With the surface you are stuck.
The device you linked to is only 32GB hard drive. Thats really tiny and you would struggle to put something like Word on along with your software. The screen is also 10inch which is a bit small for regular use but ok for portable use
You might be better looking at a second hand small laptop which will have a bigger battery unless a couple of hours is enough