I love how they can give you everything needed for your business needs in one place! There really isn't anything i dislike about this system so far (knock wood).
It's also very easy use with my previous knowledge as an accountant because it has all those accounting functions built into their software which made things easier than doing them through Excel or Quicken - not only is there more functionality but its way faster too due mostly do these features being integrated versus having separate programs running at once!!