Yes, I can attest to that.
After installing SL I used CCC to make an image before tweaking, had to restore (several times) and SL is clearly faster! Repairing permissions when altering kexts does take less that 40 seconds, booting is quicker, shutdown too.
When restoring, if you format or repartition your drives (even for 1 partition) make sure to take note of the new UUID. Restore image and it should mount on the desktop. Copy the Extra folder to your Leo desktop and delete it from root of SL (and boot.ini depending on your setup), install Chameleon 2 (I use rc3, so I use the boot.ini that comes with it, not the old one). It will make a new Extra Folder for SL and a boot file. Delete both. Edit smbios.plist, com.apple.Boot.plist and PlatformUUID.kext, replacing with new UUID, from SL Extra folder on your Leo desktop. Copy it back to root of SL.
I usually reboot in -x32 first time. Its know to be "safer".
As soon as you boot, run Kext Utility and repair permissions.
Then open terminal and type any command. if you seen this line
Code:
dyld: shared cached file was build against a different libSystem.dylib, ignoring cache
run this command
Code:
sudo update_dyld_shared_cache -force
enter password and let it run. Supposibly, 10.6.1 fixes this issue, but I have fixed it already so I dont know.
Reboot and you should get to KP's whatsoever.