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Yes all clients basically share the 20Mb/s of throughput that you would expect on a single AP. However extricom implements TrueReuse which allows (as long as there is enough spacing between the clietns, not per-se in distance but in dB) to transmit in the downlink at more then 1 place within the bss.

In the uplink clients will already transmit as soon as they pass the normal CSMA/CA.

Comparing this to a cell planing solution, where you will never get to 20 Mb/s per channel (because of co-channel interference), it is much more static and reliable.

Secondly you can put as many AP's in an area to assure that all clients will always be transmitting and receiven on high rates, where in a cell planning solution they will rate adapt untill they roam, slowing down the whole bss.

On top of that the extricom system can have 4 "blankets" (in each AP there are 4 or 2 radios), allowing you assign 1 (or more) ssid per radio, so then you would achieve even more throughput(please note that for this to work perfectly you need quite a dense placement of AP's).

Furthermore there is no roaming, all problems that you would have in cell based solution deploying voip and other roaming sensative applications.

Hope this helps a bit, if you have more questions, shoot! :)