I didn't really need a new computer, but that's never stopped me before!
When the new iMac Pro started shipping it made me think about when I bought my current computer. Turns out I bought it on Nov. 30th, 2012 (Gmail remembers all!).
5 years seemed like a good run for my iMac, so I bought a new iMac (not the Pro because I'm not a madman).
I really like it. The only difference I experience is that is much faster. It looks exactly like my old iMac, and all my stuff works with it so I'm a happy camper.
Though, really, that 5 year old iMac was just fine. But this is just finer.