I, also, never had issues with square taper bb's and cranks. If I was the op and wanting to change, it sure would not be going to octalink, but to hollow tech II. I have Tiagra, 105, and Ultegra level HT2 bb/crank sets in use. I can discern no difference in the bb's, and have never had to replace one. That includes one press fit that has been solid with no creaking.
I was not a fan of octalink, those bb's have become expensive.