Tree it material setting problem

Hi All,
I played with “Tree it”, and adjusted one of the trees. It seems very promising in Tree it.
Then I tried to import it in Blender 3D. Fbx format did not work. So I imported it as Obj. This time the material is awful even though I adjusted the Alpha, it is vey unrealistic.
Any similar experience or tips to make it working?

I am wondering if anybody has had similar issue?
Alternatively is there any light-weight and realistic tree option?