I've had a RasPi for some time now and it is a great piece of kit. It runs Quake III very well indeed !!! However the current state of the OS distributions is disappointing (in my opinion). If you want to use a desktop environment then it is very VERY slow. The web browser takes over 20 seconds to display the BBC page for example. Scratch is bundled in but is so slow to be almost unuseable. The Python IDEs are slow and tedious. However the GPU has not yet been utilised so there should be big improvements in the future ... I have learnt a lot about Linux though and will definitely be using it with my GCSE and A level computing students to demonstrate an alternative operating system, if nothing else. We do have budget allocation to buy a class set but not sure what I would use them for yet!