I'm also happy with the E3 rear, but I'm going to something else for the front next time. If you have a tread-depth gauge, would you check your front tire for me? I presume the MCII starts at 5/32" new and I would like to find out if I can expect better mileage out of the front. Checking your depth at 6k miles should give me a vague idea, as I haven't seen any reports of MCII wear yet. My first E3 front lasted 18k miles and the second isn't wearing any better. The rears have lasted 20-22k which is quite acceptable and I don't plan on changing to something else on that end of the bike.