difference free and pro version? is it worth it?

What makes unity pro better than the free version? What platforms can unity free use, and what platforms can unity pro use? Has pro got better graphics? More features? And is it worth it?

Thanks!

Unity Pro contains a lot of things that the free version doesn’t include. Examples are new graphics options and effects, like bloom, blur, and access to all real-time shadows. It also gives you the option to change the Unity splash screen, and for a commercial organization, the Unity Pro licence allows you to make more than $100.000 a year. (You can still make money with the free version, but if you ever reach $100.000, you will have to buy the full version, which should be a well-made investment anyway then.)

and for more details, you can see: http://unity3d.com/unity/licenses