Have to say regarding the Scuffmaster treatment - the pics on this site and others really don't lie.
Dabbed on a little of the black dye using the provided sponge, and gently rubbed over it a few times to remove the excess and then left it over night.
Came back the next day to give it a little more, think "well, that looks better" and started to add a little more dye, only to realise when I've finished that I was treating a completely different, smaller scuff - the Scuffmaster treatment had done such a good job I'd completely missed the bit I'd treated the day before!