The application hits all the right notes - visual presentation of the tasks, the right charts, useful information - without going overboard (as MS Project unfortunately does). It reminds me of the much missed Claris MacProject. For someone who is more visually-oriented than business-oriented, that's very welcome.
Unfortunately the UI is a bit of dog's breakfast. The layout of the interface is clunky and a bit crude. Reports pop up in a Web browser window. The whole thing could have benefitted from a good visual designer.
At one end of the spectrum we have apps like Project, which are visually very attractive and flow well, but have limited functionality. At the other end of the spectrum we have SharedPlan, which feels awkward and crude, but does more.
Anyone care to claim the middle ground?