Questions on Heads up Display (HUDs)

[MrX5000]

I have a couple questions on this subject. I was wondering what the pros think about HUDS.

1) is it ethical?
2) If so, then what buy-in should I consider using it?

I'm doing the chris ferguson experiment myself. I started out with a small deposit and I'm up to about $400. I'm currently playing a mixture of $3, $5, and $6 SNGs.