The TKC's feel wierd for the first couple of hundred miles until you get used to them after the scorps, but are a very good tyre. Surprisingly good on the road, but the bike weaves when over 110 mph, but then again they're only rated for 100 mph!
Far far better off road than the scorps.
I get about 3000 miles out of a rear and 6000 miles from the front. Probably could get a bit more out of them if i wasn't stupid pulling wheelies and being daft, and i replaced them before they were down to the last mm but the handling had gone off.
Karoos are a little better off road but don't last as long as the TKC's according to my mate who has used both, but this is hearsay as i haven't personally tried the Karoo's.