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I was talking candidly with my guy from BMW the other day and asked if there was any concern about the turbo longevity of the N54 engine, especially in the hands of (presumably younger, tuning oriented) 135i owners. He said so far the warranty claim rate for 335s has been normal and he's not aware of any inherent weaknesses in the engine. He did admit that the 135i will likely bring any shortcomings to the surface quicker if it becomes the tuners' choice.
FWIW, I used to run a tuning shop that did a lot of VW/Audi 1.8T and 2.7T tuning, and we never sold or installed turbo timers. Drive like a rational human being for a minute or so before shutting the car down and you'll do just fine. Not only do I find them to be useless gimmicks, I also haven't found a single one that doesn't look like an utter afterthought once it's installed. Be sensible with your warmup and shutdown, and maintain the oil and you'll be fine. My $.02.
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