Willbender is the most fun i have had playing pvp. It has above average mobility that can stick even to the more slippery daredevil and having a good burst that can down an enemy with a good rotation. I really like the ability to disengage a fight you may be losing and then easily reengage when getting aid.
So far willbender for my experience has been improved from the first beta.
The only cons i can see atm is that sword 4 feels slow for a finisher it would benefit from a faster animation or just make it a one big damage strike. Second is that the flames needs more significant damage.
Overall im enjoy playing willbender in pvp right now and with a few more adjustments can be an amazing elite spec.