For those who have done this, is Lion a worthwhile update? My computer is running fine with Snow Leopard but I'm tempted by the latest and greatest technology. I don't want to do it if the hassle will outweigh the benefits, though. This is what I've got -- iMac from April 2009, running primarily web browser, word processing, iTunes, Spotify, and Audacity (audio software for podcast production). Thanks for any input.