we thought we would try one, wiped out a fg pluss a non grouped bot! and they were only blue to me at 47 and had a yello con broodmother they keep coming back if you dont kill em all, take two fgs withya!
me and another lvl 34 were farming seals and took a throwing axe hit one and 4 came, Not good conn'd orange and yellow luckily there was about 6 or 7 people to save our necks, OUCH!
Be careful with your pulls. Usually there are groups already hunting there that can help you - but they won't help every pull :) Usually 2-3 extras will come in a bad pull, in a REALLY bad pull, I've seen upwards of 7 come.