[stkni]

Meh, but the scale change is too quick to see if it's going higher or lower (at least to me) so I don't think it gives that much of an advantage.

Even trying to use that information I can't seem to get much better than the 50th percentile, on average. Which is pretty much what I had before I read your comment.

[erikb]

After about 30% of one round you can see from the previous trades if you are more on the low or more on the high side though. And the moment you see (or rather "feel") the scale change you can make a decision.

I couldn't pinpoint it as well as the comment above yours but I also feel the interface helped a lot in making good decisions.