It's always fun getting a new PC. A chance to start afresh, with a clean slate, and without all the crud that gradually builds up in a PC as it is used. Nice!
Except that you inevitably have to then go through a long process of identifying the software you need and reinstalling that, of setting up all the preferences so that the PC is actually pleasant to use, and a whole load of other hassle. One of my particular favourites is the task of copying across all the vital data that has been built up over the years, which of course you don't want to lose.
Basically, the idea of having a new PC is great, the short-term process of getting a new PC sucks for a few days, and then actually having a new PC is quite nice - for a few weeks, until the novelty wears off.
Still, new PC! Shiny!