I'm a developer for a large organization and every year or two I snag a laptop on the way out of the bottom of the replacement cycle. When I have it out people sometimes come by and are shocked, "You're a developer, what are you doing with that thing? It must be the oldest laptop in the whole agency!"

And I tell them, "Exactly. If I make my app run well on this laptop, I know for sure it will run acceptably on every machine here."