I like Cyclorama... very easy to use. I also like the Woodland Play Sets and have done some custom fooling with the textures. I have not used IC3. Microcosm was one of my most regretted purchases. I am sure it is a fine product but I do not have the capacity to understand it or make it work so I have never used it for a render and I deinstalled it long ago :( I use Nerd's Backdrop Prop and I think that might be the easiest to shoot your own images for... it is very simple but it works.