Pretty much.

http://www.wowhead.com/?talent#0ZEGM...VkbAczb:pVmzVM

Very rarely do I have to provide my own mangle debuff as our arms warrior has like 98% raid attendance for 10 & 25 raids. Even if he's not there it's not a big deal to hit mangle every now and again.

The faction champion fight I'm too busy doing other things to worry about saving 6 energy per mangle. Instant cyclones & roots make the fight so much more interesting.