Actually, my understanding is that all of those low-profile aero rims are too shallow to be useful at all. The arbitrary number I've heard tossed about is 28mm deep-section to actually realize any benefits.
I have no evidence of the veracity of that statement.
edit: hmm.. it looks like the aero section of the deep-v is close to 28, so maybe it meets the above hearsay standard. Whatever.
