EHhhhh it's okay. It does a few things (reroutes, diversions, and some of the tools for making routes in weather) extremely well. It also has a lot of flaws and bugs. At my carrier it has few, if any, people that just love it. Most are of the polar opposite opinion.
Far from terrible in my opinion but it's also far from time saving when you consider all the stuff you have to fix (bad routes, illegal alternates, if you aren't extremely careful it will continue to try to optimize and will change routes after release and then reinit'ing the route after an mel gets added so your crew has one route and atc has another) or the stuff we could do in bulk before (selecting a common runway, intersection, temp, field condition) that now has to be done manually for each flight. It's a wash on time savings. It does get intuitive though the more you use it.
