FusionReactor Enterprise includes features to help you manage multiple applications and receive detailed metrics and alerting.
Enterprise Edition includes everything in Standard Edition plus
Enterprise Dashboard - see all of your monitored instances in a single view
Enterprise Reporting - daily, weekly and monthly usage reports
System Metrics - covers metrics on the underlying System where the instance being monitored is running
Enterprise SaaS (CLOUD) includes 30 day data retention.
For a full list of ultimate features see https://www.fusion-reactor.com/pricing/