Silo is a great app if you're just starting out, it doesnt have the advanced features of the bigger apps(rendering, animation, etc) But it is a nice streamlined and focused modeling app, perfect for begginers i'de say.
Yeah I have heard quite a lot off good thing about this I think I'm going to try it out too bad it only teach animation there are no modeling involve guess I can learn modeling by using app like Blender, Silo, 3D Max, Maya if I can afford it :) and with the resource that is out there on the web it will be no problem :)