ditto on the sq taper. ISIS was a crappy solution to a supposed problem (ie, marketing types had to come up with something new) and while external bearings have theoretical advantages, i have heard enough from some very well known shop owners to know that they are not all roses.
my own personal experience is that Race Face external were not impressive at all and my FSA were fine but i had almost not ride time on them.
i am sure if i were a 300 lb single speeder (my goal by the way) i could pehaps benefit from the supposed stiffness advantage but until then, forget the hype....give me a bombproof steel Phil Wood and I will check my bottom bracket once every 5-10 years thank you...enuff said.
also, campy has been doing sq taper for eons and i think they know a little bit about bikes.