I picked up a newish (5600) Shimano 105 crankset on Craiglist for $50 and swapped out my 1055 set (older 105 for square taper bottom bracket).
Holy cow!! The advertising propaganda on the new 105 says the external bearings / "Hollowtech" makes a difference in bottom bracket stiffness -- it REALLY does!! My winter roadbike is an older Schwinn Tempo (not the stiffest thing in the world), but now when I climb all I hear is my panting!!! No more rythmic chain rub!!
Not sure anyone cares or is looking for a product testamonial, but I'm just really happy with the difference a $50 find made.
I give the new 105 cranks 5 Clydes (out of 5).