I have a 2006 Deluxe, did the cam chest upgrade with the Screamin' Eagle cam plate kit and cam installation kit with the upgraded bearings at 30,000 miles. Original spring tensioners were not bad at all, but I know that isn't always the case and have known other twin cams to crater at 15,000 due to tensioner failures. Bike runs great and they aren't kidding about the scavenging side of the pump increasing flow by 50% - I looked inside the oil tank when the bike was running and oil was flowing back like a fire hose! Very happy with the upgrade, complemented the 95" big bore kit and SE 204 cams nicely, bike runs strong and sounds fantastic with those cams at warm idle, too.
I have a twin cam 88 and these are the reasons why Harley has no right to call themselves a premium motorcycle. Charging the premium price without providing the premium parts does not make you a premium motorcycle. Yes I have corrected all these issues as well as issues with the chassis. But now that I know how Harley runs their shop I would never buy a new one. I'm even hesitant to buy a used one again unless it's an EVO Sportster.
...I used to own a 1986 Sportster,first year of the EVO motor....AND YES...BULLETPROOF BASICALLY !!!! Loved the 1200 Kit I put in too....LMAO 🤣.....Miss that Ol Sporty....but wanted Bigger Ride !!! LOVE DYNA'S and Softails!!!