After a couple of quick tests today, I would say definitely so, as on training dummy my damage was increased from 102k ticks to 129~ ticks. But (using 522 agi proc trinket) I can tell you solid stats tonight when I get into bg/arena (where gear is downgraded, agi proc trinket power cut into half).
Still the +40% savage roar is nice (tooltip might be bugged for you as well)
This is from icy-veins.com (great little site):
If socket bonus is not at least + 60 AGILITY
Go for AGI gems. That means:
-Delicate Primordial Ruby / Perfect Delicate Pandarian Garnet for RED sockets
-Adept Vermilion Onyx / Perfect Adept Tiger Opal for YELLOW
-Glinting Imperial Amethyst / Perfect Glinting Roguestone for BLUE