I like having a circ pump. By most accounts, it's more energy efficient. Will keep your temp more stable. If you have ozone, should also have a circ pump. Big motors won't have to cycle for heat, so will be quieter.
But like so many other things, it's an option because it's not required, so what it's worth is up to you. Though you can often use stuff like that as a point of negotiation.
