Overall we are very happy with our 2006 Xterra. Our only complaints are minor. Fuel economy isn't great, but we knew it wouldn't be good going in. We are also less then thrilled with the back seat. Once you're in, it's comfortable, but getting in and out is a hassle with the rear wheelhouse in the way.
Power and acceleration are good, although they do contribute to poor fuel economy. We also like the overall appearance of the Xterra.