Have to admit I was surprised at how well things run on the latest low power Intel Atom processors.  Speed wise not much shy of the relatively high end laptop MS gave out at the PDC a few years ago and certainly capable of running Visual Studio for developing Metro Apps (I am not saying this would be your device of choice mind, but in an emergency it will suffice and responds better than you might have thought)

I ran some basic benchmarks around the new VivoTab and a few other devices for comparison:

http://websurfaces.co.uk/2013/03/07/asus-vivo-tab-intel-atom-windows-8/