Illustrator?

Couple of questions for the professional Illustrators out there.
I'm currently talking with a few London based Illustrator Agents. I've spent too much time in the last couple of years working in animation to be out of the loop.

What has been your experiance with Agents?

Anything I should be looking out for or be wary of?

And on a related note, after ages I've just had a look at Illustration Friday. This week they have 450 contributers.

Are people still doing stuff over there or is it just too big now to bother?

Come on now.

Give.....