I love the TKC80. I can and do scrape peg on the bike with them on and they feel rock solid to me. The only issue I have with them is they don't last. I can wear out a rear tire on pavement in less then 200 miles. If I am taking it easy, I can make the rear last about 2,000 miles. I do get good mileage out of the fronts.
I run a TKC80 front now for everything, then swap the rear depending on what I am going to be doing.