I like that it can be used for multiple emails accounts at once instead of having to manually enter each one in separately.
Also with this software you can track your bounce rates as well! Overall its pretty great but sometimes you have to go into "manage" or something similar and then click refresh before the results update which could take time when using alot of different domains/emails etc. You also need a little bit more training than other programs because there are some things they dont explain thoroughly enough. For example how to use their reporting features (which is what we currently use), if you just want an easy way to check all our bounced emails at one time without entering them individually through my spam folder, bspruits does exactly that!