Count me in for the second one... just got our EVOs last week and they came 2.2 stock, was extremely pleased to see a rollback method had been found just a few days later.
OP: To give you an idea of the process I went through just this morning: I rolled back to 2.1, rooted with SimpleRoot, install Superuser + ROM Manager then updated to AC-ROM from the sticky in this forum.
The ROM is mostly stock with some good tweaks... the main attraction for me is perflock is disabled in the kernel, no need to disable it in SetCPU everytime you reboot.
Battery life is already remarkably improved... amazing what underclocking to 128MHz when the screen is off does for the battery.