How are the emission control systems holding up?

Looking at purchasing a new to me mid size excavator. It's a newer machine, tier 4 final compliant. I'm not a big fan of gadgets and too many sensors, electronics etc., but it is time to upgrade. The emission control system is one of my concerns. Is this something to be concerned about/will involve trips to the dealer? The machine is a JD 60G in case that makes a difference. Would also appreciate feedback on this machine if someone is running one. Thanks.

(a good friend of mine runs...

How are the emission control systems holding up?

How are the emission control systems holding up?