going a bit offtopic but:

as I read Neoaxis is using an optimized version of Ogre and offers more tools and code environment, including a lot of sample games, built in pathfinders (tile based and Recast too), very easy and fast simple or a bit slower pssm shadowmapping, geometry instancing. but this huge environment is a disadvantage too, you should start to build your game based on this full complex C# script package, which is a bit complicated for me (and not commented well), and I have not found good enough tutorials for this engine (only how to start, and very advanced ones). but what I found to be very effective is the usage of own game object classes, which can be programmed, and then used in the editor too...

the other engine I tested is Esenthel, which is C++ based (but contains a lot of very effective simplifications!), offers something similar as Neoaxis, but features a nice all in one editor, a good tutorial package, and a well commented header browser containing all engine classes and functions. it was enough to start with this engine with my limited C++ knowledge, and create a simple level where I can control a group of 100 soldiers using the built in Recast pathfinder. and supports DX10. and multiplatform. and you can buy professional sample game project for making MMO games. and free server support. and good model converters with good work-flow. but its performance is not the best, requires good hardware.

I do not mention Unity because of its higher price category (after I got some 3D experience with 3DGS I could do easily anything in Unity I wanted, but the free version does not offer important things like LOD). the 2 engines above can be used freely with full feature set, but with limited source code, you need a licence only when publishing commercial projects.

I think 3DGS license parameters and pricing could change in the future as there are very potent competitors for lower price, offering more features. at least its pro version price should be lowered significantly. it's easy to start with it, but later easy to change to other engine too...