This is a useful app for those who really like to know what their Mac is doing at all times, or who may be trying to diagnose sleep or battery problems. It is nicely designed, very informative, and does not seem to have any significant impact on system resources.

I think it deserves five stars not just to counter the fatuous one-star review below, but because having tried it out for a month, I can think of nothing that I would like it to do differently or better.