Feels thin, handles smooth
Used a friend's Xion for cragging and couldn't believe it's a 10.1 as it felt more like 9.6mm's I've used. It fed really smooth through a variety of belay devices (grigri, grigri2, reverso, Smart) and the rope itself feels supple and soft. The other rope I was using that day was a stiff 9.8 Mammut Tusk and the difference between the two ropes was night and day. I haven't had a whole lot of trust in Petzl Ropes since their initial release and subsequent durability issues, however the Xion has restored my faith in their ropes.