The best feature I like about guardian is it's ability to be used by multiple users simultaneously without any issues or interruptions which makes life easy for us when managing our fleet assets in real time manner with ease! It has helped me manage my large fleets efficiently since its inception & no doubt this will continue as long we keep using them because they have been doing their job well so far!! Nothing much at all from what i can think off right now but yes if you are looking out there then go ahead otherwise stay away.
We use Guardiams software daily within an organization where each user handles his own section/department such tasking being done faster than ever before compared too traditional methods would take days even weeks sometimes months just due lack knowledge etcetera!