Comment 33 for bug 923749

I've tested this feature with a mouse and 2 trackpads, in single screen and multi-monitor situations. This feature is easiest to use when set to "High" sensitivity. I think it would make sense to make "High" the default, and allow users who are getting too many false positives to back that off if necessary.

Works best means:
1. It's easiest to reveal the launcher, and I think more discoverable (won't have as many people thinking the launcher is broken).
2. It's fastest to reveal the launcher. With the default setting, it is a long process to make the launcher reveal.