Using iRules to modify web application layout based on bandwidth CSS has become the primary mechanism through which applications are "skinned" and provide the basis for many of the Web 2.0 effects ...
This could be helpful if the connection is long-lived, but the results from this command are quite inconsistent without a large sampling of event triggers. It may be good to deliver the normal page for the first X number of requests within the session to get a better idea of the bandwidth before suppressing content. My $.02.