It's back and forth for me and Blender. It has been my modeling app from the beginning and I expect it will remain so. There's never been anything I wanted to do in it with modeling that I couldn't easily do. As a renderer, I've tried a few different ones, and like the ambient occlusion function in the current internal renderer. I have not had any success with the Yafray renderer. I am currently using POV-ray as my renderer. I find it superior to either Blender rendering engine for now. 3D applications are like women. You will use several in your life. :O)