Well, since I was the one that brought it up in the ESB:R thread, it's probably fairly clear that I don't like it.
It just seemed unnecessary to me, and on top of that it looks like a freaking miniature lightsaber (it instantly reminded me of something I saw where someone used a tiny lightsaber to peel potatoes). And it just kind of appears as the camera zooms in on it.
It would have been better, IMO, to erase the syringe markings (which Ady did), and add something that looks almost acidic inside the syringe (like in T2, the drano or whatever it was into Silberman's neck, but more "alien" looking).
I do want to make it clear, though, that the torture droid "lightsaber" is one of only two things I dislike about ANH:R (the other being the fake slo-mo when Ben dies) - everything else about it is pretty damn perfect. I'm indifferent about the Ben's hut scene and the added music, and the SE-added "searching around the escape pod" shots bug me but not too terribly badly. Other than that, it's all perfect.