I like to work with C2 but it has no 3D Engine, to work in isometric view is possible (difficult and limited), but "real" 3D is much better. I wanna work with BlenderGame Engine or/and Leadwerks Game Engine. Basic of BlenderGame Engine isn't so difficult, but for Leadwerks Game Engine i have to learn Lua scripting. I would be glad when i could install a C2 plugin (adapted for 3D) in these engines. I bought Leadwerks because it supports Oculus Rift, blender import and light/shadow quality.
I tested Q3D demos, but this quality isn't so good.