ive been using elemental blast in pvp, just because other classes can kill your fire ele very easily so it seems kinda useless, unleash elements is also nice and could offer some nice options for weapon swapping etc, but for now elemental blast coupled with ancestral swiftness seems nice for burst and can all be worked into an ascendance macro which ill make a video about soon
for now you can check out elemental blast in a duel vs warriors
http://www.youtube.com/watch?v=Wuirzyc0d7Y&feature=plcp
as you see i get kicked once or twice in the duels meaning im fully locked out because EB is all 3 schools which kinda sucks so gotta be careful when using it