I still have my mid-2006 17" 1.83GHz. I still use it occasionally to surf the web and to do minor editing of photos / videos. I also let the kids use it for their homework (web research, document writing) and playing computer games (Minecraft!). It is already very slow, its 160GB HDD is just not enough (I have several external HDDs attached to it), its 17" screen seems small compared to today's standards, and it still uses Snow Leopard. But, it is still usable! I'm looking forward getting the next iteration of the iMac, particularly the 21.5". I'm hoping they use the Skylake processors and add USB-C in the next version. I'm still thinking what to do with my current iMac after I get the new one.