I don't think so. This is a quality aluminum frame - Jamis's best aluminum cross frame about 10 years ago, a very nice, stiff frame. I had a good crank on it (Ultegra 6503 with Octalink BB) at first and the change was obvious when I switched to the cheap crank with square taper BB, but not before.

I bought the very low grade (cheap), used triple with the square taper BB to try out lower gears than my Ulgegra (46...26 vs 53...30) just to try it, thinking if I liked the gearing for hilly commuting w/ weight, I'd upgrade. I noticed the flexiness on the first ride and intended to upgrade asap, but that was 2 years ago! It doesn't bother me that much, and probably the aesthetics of the crank on an otherwise Ultegra/105 bike is more of a concern (vanity, but not much).