Our differentiators are that we're easy to install and setup but as powerful as something like Nagios, we're designed for automation and continuously changing environments. We also have some cool technology around interactive alerting so you can fix stuff when you're out and about from your mobile phone. Any feedback would be awesome - be as critical as you can please as we're hoping to release a freemium service in the new year.
The url is http://www.dataloop.io
