If they are truly fixed I might pick one up. I loved the one I got, but the jitter is too crazy. I didn't really feel it in game, but in windows sometimes it just went crazy, made me think that it could be making me miss when in game.
Mouse is so light, playing on a low sens feels so easy.
i have both the abyssus and abyssus mirror with were purchased mid and late 2012... i noticed at 450dpi the mirror would jitter, but at 1800 dpi (its native dpi) it never jitters. i've heard several reports of the same thing (not the mirror specifically, but the abyssus in general)