I hear ya Frank... I was concerned about that too at first. But it turned out to be no problem for me. Not sure why... maybe ya just get used to it (although there was no noticeable adjustment time), or maybe it's because the Acewell is very easy to read due to its large numbers that are easy to read under any light conditions.
If that's your only concern Frank... I'd have to say, no worries. It's just doesn't seem to be an issue. I'm sure Graeme will chime in with his experience.
