In iTunes, it displays info about your library (the amount of files, size, and time), as does MB. However, in iTunes, when you click on it, it changes how the time is displays: Instead of being exact (such as 2:23:59:59), it converts it to an approximate (2.9 days). I wish MB could do this, and maybe more [display the time info in seconds, minutes, months, years, etc.; display the size in bits, bytes, kilobytes, megabytes, gigabytes, terabytes, etc.; display more info about the files themselves (shortest/longest track, first/last played, amount of each file type, etc.)].
Most importantly, just the ability to switch the time from exact to approximate.