Josh,
I found that, for me, the RSi's were an improvement over the lvl 85 Nikes in holding greens. Sean is right about a glitch or 2. With the Nikes it was the 8 Iron. With the RSi's, it the PW, and the 3 Iron (sometimes).
I bought them when i hit lvl 90 earlier this month. I Tied for 1st (lost on Tie Breaker ended up in 2nd) in the Week 33 multi-round Best of Par 5 tournament, and was promoted to Legend last week when results were released.
I also won 2 Best of Par 5 tournaments at my Country Club that ended last week. 2 rounds full 18 holes, default Tee and Hole locations. No red T specials. In each I shot scores for the 2nd rounds of 72 and 74. Won 1 of them by 1 stroke, and the other by 9. I owe it all to those Irons.
The biggest thing to keep in mind is how long will it take you to get to lvl 97 or lvl 100? When i hit lvl 90, I figured i needed roughly 300,000 more XP's to get to lvl 93. And just over 1,000,000 to get to lvl 97. lvl 100 is about 1,800,000 from lvl 90. So the RSi's will work for me while plodding along that trek to unlock those other clubs.
Also, I've posted it before, but I'll say it again: Sean approaches this game in a way most of us can't (or won't). He has availed himself to any and all info available to improve his game, and as he says, beings somewhat OCD he works at things until he gets it right.
I'll never be that good. Time and Gravity have made that clear to me. But my hats off to Sean for his hard work and great results.
Hope this helps,
phred952