Never really noticed much difference in magnification or unit size or weight between my 3.5-10x40s and my 3-9x40s, Heck I had to go look in the safe just to confirm the VX and Vari-x 3s on some of my rifles were in fact not 3-9x, Had to look at the little gold ring to tell what was what The 2s are for sure but the 3s are indeed 3.5x10.
Good catch, but a simple correction on the slight difference in magnification range would probably have sufficed. :)