I changed from a set of TaylorMade R540s which were over 10 years old, to a set of Ping G400s 4 years ago and there was an instant improvement in my scoring. Hitting some of the best iron shots of my life, I'm sure the G410s and G425s would be even better.
One thing I did do with the old ones which gave me an improvement was get them regripped, didn't actually realise how bad they were until I got the new grips on.