The original Moto G is a great example, it was soooo smooth, with such a great screen and battery life, you couldn't believe you'd paid less than £100 for it.
Yes mine is still going strong, although admittedly it hasn't been used a lot - I bought a Windows phone a couple of months after the Moto-G, which became my main phone. The Moto-G is used for different purposes, and has a lot of life left in it still !