I'm also on my second set of these speakers, I sold the first with my last computer and later regretted it. I use them with my iMac and they are perfect for that job, I mainly use them when I want a break from headphones. The only really issue I have is that speaker position needs to be very accurate to get the most from them, it seems that unless you are sat directly in front of them you loose a lot of detail from whatever you are listening to. But for the price they are excellent and I haven't found anything else in the same price bracket that is as well built and sounds as good.
JBL SoundSticks II 2.1 Plug and Play Multimedia Speaker System - Reviews