After reading about how the "instant" cast aint really instant and takes about 1 sec to make before u can cast anything else due to cooldown.
I made some adjustments to my cast bar, and now I can do around 200 more dps, just because I removed this skill.
That for me is a double edge sword.
On one side I do more dps which is awesome, great love it, die monsters !! whoo hoo
On the other side, I just gave up on my class skill, that was considered at first to be a nuke bomb of dps.
so both sad and great at the same time.