A couple of months back I bought a cheap refurbished windows tablet - about £90 - to use as a digital music storage device for church. 12" HD screen, detachable keyboard/screen cover, SD memory card slot to supplement the 64GB of internal storage. It's not exactly a fast performer, being pretty much on a par with the late 2008 Macbook, but it's about half the weight and the screen is really crisp.
Battery life is brilliant.
When new, the macbook would do 4 hours of word processing, or 2 1/2 hours with wifi on for internet. The Dell XPS was similar, although wifi use made almost no difference, but image processing drops life to 2 hours.
This thing gives me >10 hours of internet use.