It's very comfortable, not as comfortable as the Ki 5 or 5g of course, but it is very arm friendly. If your criteria is that any racquet you try has to be as easy on the arm as the kinetic racquets, you aren't going to have anything to demo. I demoed the O3 Tour mid, and I would have gotten it if I had been able to get a little more power on the serve. It's very easy to swing, and I think the O ports do help in that regard. I had no arm issues whatsoever with it.