Here is my take on it. I have been deploying high density wireless in education for a while. Client load balancing send out a status code 17. The issue is that devices that do not support status code 17 fails to associate to the access point. My first experience with that issue was with Apple devices, then some Dell laptops and HP laptops. So in my opinion, I don't enable that feature due to the impact it has. Does it make a big difference... from my experience in education not really. In a dense environment you will have devices join other AP's around the area, but you might see more client associations on a given AP. If you design for high density I think you would be fine. I don't have any experience with other vendor wireless as much as I do with Cisco so I really can't compare.
We use Veriwave to test high dense user.
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809c2fc3.shtml
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-Scott
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