I like that it was easy to add multiple sites in one go with this tool (it's not always possible when you have lots).
The interface can sometimes be hard or confusing if there are too many different elements/features going off simultaneously - but they've added an option so people don't need to try each feature separately before signing up! Easy process once we'd signed up initially though. You could also use them as tracking numbers instead? Or just get yourself some google analytics accounts set-up already otherwise :) We used their platform mainly because our website has been through several makeovers over time; however now its easier than ever thanks to them providing updates regularly etc.