It's a good agency but not the only agency in town! I'm sure they don't have 100% of the worlds buyers and that's why you should spread yourself around...
They have massive server problems at times and given their size they could loosen the purse strings a bit more and if your non exclusive then being limited to only 15 images a week or longer is not productive for an active photographer.
David
Last serious server problem was in Setember 2007, almost two years ago. There have been some hiccups after that, but nothing unusual for a web page, not serious at all.
