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Not quite true - the stiffness of something in bending depends on its second moment of area. That's why steel structures use I-beams - to get as much mass as far from the neutral axis of bending as possible, without increasing the weight of the beam. By flattening the spoke they've made this different in the two perpendicular directions, so it is stiffer in one direction and more flexible in the other.
However you are right that they will behave the same in tension/compression as the material (so Young's modulus) and cross sectional area (so stress) are the same.
hamrack-
However you are right that they will behave the same in tension
When you apply any load other than tension to a wire spoke, get back to us with your maths :-)
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Not quite true - the stiffness of something in bending depends on its second moment of area.
Undoubtedly true. But in this context about as useful as knowing that a tomato is a fruit when choosing the ingredients for a fruit salad.
gbj_tester
Brommers
CX-Rays are Lasers with the centre section stamped flat. The cross-sectional area of the spoke is therefore the same as a Laser. Since the stiffness of the spoke depends on the amount of material used, they're no more or less flexy than Lasers.
I've used CX-Rays on disc wheel builds, including my 29er wheels. They've been fine.