Experience would be higher than bandits for sure! no doubt, I think it will be over 2-5kk+/h (can't tell for sure because I normaly hunt there with experience prey)
And your friends are right, knights must have an element sword to deal some damage, since this creatures are highly strong agains physiccal damage; I didn't know exactly your level or the weapon you use to hunt, so I could not be more precise about the weapons you could use.
On the other hand a good thing about gazer spectre is that they do not have that much Hp, so the druid using: ice wave, avalanche, terra wave and Ice UE will make to kill all the respawn fast enough.
If you try them, to feel safe, the druid can go down first and lure away some of the gazers in the entrance, so your first respawn is not full of creatures. Im sure you'll be ok, but just in case :)