I've been on the O1 for the past several years and last season was my first go with the AXL. Wow, these bindings are high performance! They feel much more active than the O1 and let you rally the tele turns. The tour mode is good and pretty easy to use and seems to ice up less than the O1. Plus if you want to back off and ski some powder you can change the position and keep your tips from diving as much in a less active setting. The weight addition is not really noticeable.
It's nice not to have the cartridges loosening up all the time! Nice work 22 Designs.