Yes, it's worth it. I used it on the Gingerbread Sense ROM. No more Sense redraws and better multitasking. Though after a few days, things tended to get sluggish, so I would let it reboot and everything feels snappy again. The engine flush option didn't do much here.
I used Stericsons' Busybox from the market, works perfectly. 1.19.something. (Or use the attached busybox in the script's topic)
S-off / Unlocked
Ranger4740 is right about the need to have write access to the system partition: you need either s-off or an unlocked 1.02 bootloader.
Scrolling speed in script
Personally I hate Script Manager, Terminal Emulator works just fine. Make sure you set the scrolling speed to fast. There is plenty of time to see what's going on, so no need to set it to slow or medium unless you have a serious form of dyslexia
V6 Supercharger on ICS
The script is not usable on ICS in a way it was on GB. "ICS doesn't read ADJ values from build.prop or local.prop - they are hardcoded into services.jar"
This services.jar can be modded, but your ROM has to be deodexed. 99,9% of Legend users on ICS use Zeubea's ROM, which is odexed. Instructions to mod the services.jar in odexed ROMs can be found here: