I have the beta expression and the brushes are very nice, very responsive.
The program however is definately beta.
Some of the menu's are a bit awkward and unhelpful.
Import/export is a little rough and ready still.
The odd glitch or three here and there.
But it shows a lot of promise.
And yes you need MS .NET 3 installed first.
Apart from playing with the brushes I don't use it much at present.