A golf buddy recently bought the Steelhead XR's. His previous irons were the Rocketballz Blades. We have similar games / swing speed etc., and they're no better or worse than anything else out there including my Ping G's. And his scores are the same as with his Taylormades.
You seem to switch clubs like most people change their underwear, so if you have that itch scratch it. 🙂. I doubt the Steelhead XR's will be any different in the long run than the other irons you've played week to week.
To be honest, my G15's are just as good as my G's. They're slightly different, but no better. And as you and I know none of these clubs will change our scores.
But, I get it. I have relatively newer equipment in my bag. My wife has relatively new Coach handbags. We all have our itches to scratch.