As a power user I tend to install and play with many utilities. In fact, as an Enterprise Systems Architect, that’s what I do a lot during the day as well for large companies.
On all of my Apple systems I have installed Monity and the Monity Helper. These tools provide an accurate and comprehensive introspection into what is occurring with the system, and is much easier to walk our Apple users through than looking for all this information across other tools. Monity centralizes this information right in the notifications drawer provided by Mac OS X.
Battery displays are accurate on the MacBook Air, MacBookPro and apple accessories like the Magic Mouse, Magic Trackpad and Apple Wireless Keyboard.
I would not hesitate to make the recommendation for other users.