Can't stress enough how truly GREAT is this AA, It's basically an UNRESISTABLE NO-MANA FAST-CAST version of ENSNARE, which frees up a spell slot and works so much better than the spell, which has been invaluable for all druids since the first day they are able to buy it.
Except for mobs which cannot have their run speed modified, I have yet to get a resist when I cast ENTRAP, which is incredible.
I would have paid 100 AA's for this ability, but don't tell Sony that! ;)