I just did it, about an hour ago.
Recently I have no time for big grand PC games and what I have been playing are smaller games likes Super Meat Boy and Cave Story. I also always wanted to try gaming with controller and this looks like best time to start.
My main justification however is that if I'm gonna make games, I want them to have controller support and for that I need a controller. While 37? may look like a lot for a controller, I have never saved money on peripheral controls because unlike other PC hardware their quality lasts quite a long time.