I upgraded from The Nike Level 85 Irons to the RSi2. The reasons being are first you get and extra 5 yrds on your 3 iron(220 Nike versus 225 RSi2). Secondly, you get a full point(3.5 vesus 4.5) of spin. Makes a HUGE difference. These are the pros so what is the con? The only con I see is .5 meter speed difference that you will have to get used to.
So 2 pros versus 1 con on a weighted scale would render the pros. Therefore, I recommend you upgrade.
At this point you have 2 choices at level 90. Keep your level 85 irons or buy the RSi2's because your next chance to buy better irons after level 90 is Level 97( Nike High Level). Now here is the problem. Leveling up takes a Loooonnnngggggg (LONG) time when you are in the 90's. Decisions Decisions......Hope this helps.........
Earlwoodsson