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Mine have never worked loose. If you use the right bb then they won't. If the tapers are damaged they will wprk loose but tapers get dmaged from incorrect fitting mostly.
I generally find external cup bb's give me fewer miles than a good square taper. I had 3000 from an ultegra bb (external) on summer use on the trek but since i have switched to chorus square taper bb and a campagnolo record chainset i have exceeded that mileage during crappy winter weather.
I do ultra torque super record on my race bike. Must give that bb a service not something i have to do with a square taper bb. The only benefit of external bb systems is lower weight but not by much so i am quite neutral on this. Most of the chainsets i own use and use cartridge bb's. I'm a fan.
Stronglight do good double chaimsets called the impact double. Readily available and a similar weight to the op's campagnolo chainset.
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thecycleclinic
Are you referring to the square taper version? As I've already got two of these on other bikes. But they're both beer can shimmed on the taper, as I've found the cranks eventually work themselves loose.
I thought the external bb were more reliable?