hey man:
i tried to get the same information on a different device with no luck. i think the CONSERVATIVE rule of thumb is twenty five users per AP on corporate grade hardware. Given the fact that you can get third party firmware for the device, i would think you can handle that with the right firmware.
an alternative would be to spend 5K on a wlc2006 and a few access points. I have eighty users on a three ap network with no complaints.
please don't forget to rate the post.