I'm not convinced that the external bottom brackets are a step forward compared to the older internal type such as Isis splined, square taper or octalink. Thankfully I've never had the displeasure of press fit, but I'm probably not getting more than about 1500 miles from external ones. I've had pretty much all the shimano range from Tiagra to ultegra and Deore to xt and they're all about the same. I'm currently on an Uberbike BB which has uprated skf bearings and I'm not sure if there's a hint of clicking starting now I'm at about 1000mi.
It's not the bike as I've had the same experience on three frames, (steel, alloy, carbon). BB shell is parallel, torqued correctly with correct number of spacers/washers, I don't ride standing and I'm only 72kg.
What's other peoples experience with BBs?
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.