This handy little infographic made by Venturebeat was a real eye opener for me, personally. Mainly because I assumed that the PS Vita had made much less of a sales impact than the PSP, when the reality is that it was quite close. In fact, I had a lot of assumptions questioned through this neat sales chart.
The above only shows some of the story (you can check out the full thing here) but what I found surprising was just how close first week sales were between all of the major handheld releases -- which probably says that a majority of early adopters will buy new kit no matter what.
Also -- another interesting fact is just how little early sales of a product represent the final lifetime sales of a device. The DS more than any other device shows that, but may be the exception, as a result of the fact that it sold more than almost any other console ever released in the history of mankind!
Regardless, it's a cool little visual tool.
Thanks to Statista for use over the above graph. You can find their homepage here.