Weirfan
I never hit the I20 irons. I did hit the I25 when I was in Arizona, can't say anything bad since I got a hole in one with them.
The big thing Pete is the 43! Steel....feels sooo good. I really see feel being the difference. Mine also have the Nippon Modus 105 which feels as smooth as everyone says.
I don't want to sound like an ass but I hit these so well that forgiveness never enters my mind. I had the x flex cfs in them and they were crap. Got properly fit and changed to the Nippon Modus 105 stiff and it's silly how I seem to never miss the middle if the clubface.
If u could pick up a used set with nippons....try them first but holy crap. Normally I hit 12-14 greens. With these, that would be a bad day.
I've hit these so well, my chipping has suffered because I don't miss greens.