I like how easy it was to use, especially when compared with other platforms we've used in our previous campaigns for state elections as well as local races at City Hall! It's very intuitive - no training required whatsoever so far (we're running an online campaign).
We have had some minor issues logging into/getting your account set up but they are quickly resolved by their tech support team who work around midnight every night of weekdays US business hours only which makes them hard not too picky about getting things fixed ASAP sometimes. The best thing though has been having access 24x7 via mobile devices or desktop computers without worry whether there will be any technical glitches preventing us using this software during "off" times such as weekends etc..