It’s hard to justify a tablet over a laptop/netbook.
My sister had a Vista box that virused so she bought another laptop. I wiped the Vista and installed Linux Mint 14. It works like a charm except for sleep/hibernate which doesn’t work. No viruses and it does everything I need.
Sleep/hibernate doesn’t work on my otherwise excellent Toshiba. Or rather, wake up doesn’t work. But that’s probably a hardware issue.