I would agree that the performance is greatly improved. I haven't done any extensive testing, but I do notice network performance improvements when the tcpip.sys is patched. I have also patched it on a few of my friends machines, and they notice improvements as well. The only trouble I see is patching the tcpip.sys for the 64 bit version. From my tests, you can still bypass the driver signature check on boot in SP1. I do know there was something called the "ReadyDriver" that was able to automate the process of selecting the option on boot, but I'm not sure if it has been updated for SP1. I'm not sure if it can easily be implemented in Vlite, but I'm willing to guess it's possible.
