I assume you mean over using mod_rewrite to do proxying direct to backend app servers?

If so: - SwitchPipe controls backend app server processes. If an app isn't being used, it doesn't need to be running. - If an app is under heavy demand, I want more instances (up to a limit) to be launched to deal with it. - SwitchPipe deals with all of the port numbers. No port numbers to deal with as a user.

Just some minor points, but with big usability gains.