The ability to pull up historical data quickly without having to go through multiple screens or layers of menus. In general, it's very easy to use when pulling up your own info from other sites and reports that are already saved in this program. I haven't found anything I dislike about Site Line so far. There aren't many features that have been able to draw my attention at all yet which has given me more time to concentrate on using the rest of the site. However, they do offer a free trial version if you're interested in giving Siteline a try! We've had some issues recently around our electrical distribution systems as we start preparing for future wind turbine installations but Site line has helped us find out exactly what areas can benefit most from an upgrade in order to accommodate any new developments.