I like that it is easy to keep track of all my clients's information, including their billing info! Also love how they are always adding more features for you as your business grows - just make sure when choosing an email marketing tool (or any other service) do some research first; there aren't many "free" options out in this arena anymore so be cautious about jumping into one without doing thorough due diligence!! They have helped us with our bookkeeping needs since we opened up shop nearly 8
Pros
Great user interface
Easy accessibility via both web & mobile device apps
Free trial period allows time flexibility before committing$