Forum Discussion
I'm in a unique position because I've used pretty much all the features from early on. I'd say the one thing people probably should use is the marketing suite, and this is only getting better. Where most companies have a mental block is in reaching out to their list, regularly, and the marketing suite makes that easy. They are rolling out a feature where you can manage a whole marketing calendar from one place, you guys HAVE to check that out when it comes out to everyone. It's really helpful especially if you have other people helping with making posts and stuff. You can have them post to Facebook right from Jobber.
Till this becomes fully rolled out, I'd highly recommend people set up a regular cadence of sending out educational emails to their clients.