There are some great tutorials from Buzz3D on how to model using GameSpace (links on the GameSpace site). I have Truespace 6.6, but recently downloaded GameSpaceLight (free - but only exports .X format) and am playing with creating low-poly models. The tutorials have got me to move away from using boolean combinations of primitives to extruding and tailoring mesh parts - much more efficient poly-wise. I haven't got as far as skinning or exporting yet, but it seems to be going well so far.
I have had a couple of crashes - usually when accidentally trying to add an edge to the wrong vertex (creating weird non-convex geometry), so saving regularly might have to be part of the workflow.
I have had a couple of crashes - usually when accidentally trying to add an edge to the wrong vertex (creating weird non-convex geometry), so saving regularly might have to be part of the workflow.