It calculates complex routes,it gives the fastest ones, it presents them nicely on the map and estimates the time. I used it and it was great, very useful. It even took in consideration the fact that a route was interrupted because it was under renovation and calculated routes to avoid that part. The only problem was that even though for some parts of the route there are more lines (for example both S5 and S7 had the same stops for the part that I was using), only one of them was presented in the route. But it wasn't a problem because I realized that quickly and took the first one that came.