I bought a new Mastiff in 06 and have had nothing but problems. The bike was broke in exactly the way S&S recommended. It was never run hard or over revved. The first 2 years it was 3 clutch cables, leaking heads, brake rotors coming apart and a number of other things. It was serviced at every recommended service interval. At 12K and one month after the factory warranty was out the motor blew to pieces. Valve broke and went into the lower ends. I was 1500 miles from home. Got it back to home in Arizona and took it to Hacienda H.D, Fortunately because of all the problems I had previously with the bike I had purchased an extended warranty. They did everything they could to deny the claim until I got an attorney. After a month of negotiations they said they would cover most of the repairs. The motor was sent back to S&S and was completely rebuilt with S&S rocker boxes. This took a month. It took 7 months and six days before I got the bike back. The new motor was broke in and serviced exactly the way S&S recommended. The new motor has 6K on it now and it smokes so bad that when I pull away from a red light I cannot see the car behind me and it smokes when I get on it at 50 miles an hour from both exhaust pipes. I am assuming that it is valve guides and getting ready to tear the heads apart. The warranty is gone and once again I am more then a thousand miles from home. There is no way in hell that this motor should be having problems with so few miles. I have been unable to get any help from SOS or Big Dog and I don't want to dump any more money into this expensive pile of shit. I like the looks and the ride of this bike but I am really fed up with the lack of reliability and support from Big Dog and S&S.