Hi there,
i enjoyed Willbender a lot when i played through EOD with it. I used pack runes with a dragons/valkyrie/zerker gear mix Sw/Sw/GS, with reso giving me a lot of my crit chance with the 25% cc trait, which made the spec quite durable for the dps it can dish out. I played mostly firebrand for a long time and its like fresh air with all the dashes and mobility. I particularly liked the F1 to swoop from enemy to enemy with renewed justice. I'm looking forward to using it in raids, the benchmark for condi WB looks promising. I think it will be great to have DH be the bursty Power DPS spec, WB be the high DPS condi spec and have Firebrand be lower DPS but bring its trademark utility, to have varied build options for guardian. Didn't test the alac capabilities yet, so no opinion on that.
Cheers!