The ability to have multiple users at once in order to replicate as many systems from one location to another. It's also very easy to setup, install & use! There are some minor issues with it (eg - not being able to see who last updated records etc) which I'm sure can be sorted out by further updates. Nothing major so far but if you're looking for an all round solution then this should definitely be considered. We've set up our customers with their own accounts so they don't lose any of their information when we move them into different environments such as testing or production servers.