yes there are hundreds upon hundreds of 3d engines. This one was told to me by a friend so I am lucky. And I took a quick look at huge list just now and non can compair to this. This has the most functionality and looks like the makers are interacting with it's users and are improving this.

The only thing I don't like is that how much it costs to upgrade from (lets say) extra to commercial. You are wasting money unless you go with commercial right away. But besides that fact the prices seem decent.

It also sounds they might update the algrithm (somtin like that spelling) for compiling levels to make them faster. As long as engine keeps up with the future, I like it.