Picked up a GAS-100B-1A yesterday, the first time I've seen one for sale anywhere (including online):
Size is pretty much the same as GA-100; weight a fraction more and overall it feels just a very small step more solid and premium. The hands are nicely legible, the metallised indices slightly less so in all conditions though they do catch the light interestingly from certain angles. Lume on the hands is adequate, no lume on the indices. The lighting has an LED for the ana-bit and backlighting for the LCDs. The dial has a grey sunburst that is much more evident in RL than in the product shots. The overall impression of this particular model is quite muted and under-the-radar - possibly too muted for some - but with a nice hidden little sparkle on the face.