I agree 100% with the dipstick thing. However, I have real world experience now for the past 5 years and 80k miles with one on the E90, and it has worked flawlessly. It's actually much more involved than a simple level sensor since it evaluates oil level only when the engine is running (won't go into here as it can read about on web).
I've done many oil changes on the E90, and it's just like using a regular dipstick. I hold back about 1/4 qt, fire it up, check the level, add more, and done. I used to do that anyway. Now I just fill it with the right amount, check it, and done.
I hated the thought of owning this car without a dipstick. Five years of experience with it has shown all my thoughts were wrong so far. The industry experience BMW has had with electronic dipsticks has shown all the critics were wrong with their doomsday thoughts. Oh well...I still don't like it, but it has LONG ago quit bothering me in anyway.
See, I HATED fuel injection when it came along too. I ripped it off the first car I personally had with it (not counting my wife's cars) and replaced it with sidedraft Webers.

I hated the thought of power windows and locks when they became commonplace as they added needless complexity and weight. I hated a lot of stuff over the years that young people would make fun of me now for.
