hi flo65/all...well the traxxas ones look great but i have never used them, but i can tell you my 3906 e-maxx ive had for 8 years,
ive allways used the m.i.p shafts, in the last 8 years they have had one rebuild kit (barrel and pin) the drive cups have never worn out, the shafts will bend if you crash bad which is better than them snapping, cause you can run a bent shaft but not a broken one.
hammer and a vice will solve the bent shaft.
hope this helps.
chris