The aviak guards have a respawn of about 6 minutes after their death. They're not the fastest experience in the world, but they are very safe. At level 21 it took me 32 minutes to get one gold unit of experience so it is kind of slow compared to places like Paludal. Coin loot ranged anywhere from 1 copper to (my highest here) 1 platinum, 8 gold. But these birds also have a chance to drop bronze weapons which (excluding the knuckles), sell for 1-3 platinum each. It's not a bad spot all in all.
But if you have access to paludal and it isn't overcamped (and on most servers, I seriously doubt it will be), I would suggest that zone above this one for faster experience.
Edited, Oct 10th 2006 at 3:52am PDT by Momz