We all have consoles that, for one reason or another, we absolutely adored. So much so that, in effect, we bought the hardware twice.
The Nintendo DS and Game Boy are good examples. The original versions of both handheld consoles had wonderful libraries, and were fantastic devices in their time.
But there were reasons to upgrade. I didn't need to buy a Nintendo DS Lite, for instance. But some quality of life improvements, however, can't be ignored. And I know many did the same from their DS Lite/DSi to the 3DS - although I never appreciated the 3D element, and held out.
Similarly, there's some consoles that were so good - or so crucial - that we ended up buying twice so the rest of the family could share the experience. The Xbox 360 became a big one in my household. I'd return home from work - I was working midnight shifts at the time - and pop on the 360, fire up the TV in my bedroom and either watch something or play games for an hour before falling asleep.
That experience of being able to watch stuff through the console, and maybe play a game or two - for a family that grew up with lots of different games, Geometry Wars was hypnotic - sealed the deal. We ended up getting a second Xbox 360, which functioned as the family media drive. Thanks, ALDI.
But what consoles have you upgraded (or chosen not to), and what consoles did you love so much that you or your partner/family/relatives bought a second one?