It's a fine basic task-closer, but unlike the alternatives it offers no facility to exclude specific apps from being closed (some apps should always be running or can't handle being force-closed). It also offers so facility to see a list of running tasks. In this way it is not really a task manager--just a true X button (which suits the needs of some people, I'm sure).
And this is totally off the subject, but I've seen so many references to "Wisebar" on this forum it's got me confused. Are people talking about Wisbar or is there really an app called "Wisebar"? If I had just seen it once or twice I'd chalk it up to a spelling error but I'm seeing it written that way constantly so it's making me think I've overlooked something!