Interesting thread. I also have a rear DC Tatton shaft and while it doesn't have a lot of miles on it, it's given me no problems yet. But I did go through a lot of work redoing the rear suspension to get the right pinion angles for a DC shaft. I'd be curious to see if there is a correlation between failure rates and those driveshafts that are outside the operating spec for a DC shaft. I wonder if those factors, along with lower-quality components is causing the earlier failure.