I am currently evaluating Gatlin for my team and so far it meets our expectation.
Do you know if there is a plug-in to compare results of different runs; show trends, etc?
The Jenkins Gatling plugin gives a view of performance trends.
http://gatling.io/docs/2.1.7/extensions/jenkins_plugin.html
You could also push the Gatling Graphite formated data to InfluxDB and make queries through Grafana over periods of time.