Ok, so I have two ions and they're very different. Both were bought from CDGS, so I hope I have this right...
The first is a yellow 175g, maybe a medium. I also have a blue 174g medium that is much more stiff. The yellow is quite overstable when driving. I can power it HARD and it will stay pin straight for 330'+, even into a headwind. The blue is quite flippier, it will flip up from a 30 deg hyzer and stay straight for the duration.
It's the same for putting speeds, as the yellow will finish hyzer pretty quickly and the blue is more like an aviar p&a in that it stays straight for quite a while.
Is this the norm? I don't know if the yellow is a FR or second, medium or soft. It's definitely not stiff, but not totally floppy. Kinda like a used aviar p&a in feel.