TrueSpace was one of those pioneers in 3D applications. I remember looking at a section of a shelf in a local bookstore a long time ago: 3d Max, Lightwave and TS (I'm not sure if I saw C4D, but I think it's there). I knew nothing about 3d then except AutoCAD's elementary feature. At the time I thought TrueSpace looked promising. Fast forward, we now see that it is the only pioneer who hasn't made it in the film industry. And today the dry reception in the whole CG community hasn't cooled off. I don't know what happened.
I'm thinking of upgrading my TS6.6 to 7.5. I wish they come up with a trial version before I dive into it. If you're a beginner, TrueSpace is XSI with icons. The devs are just not good in streamlining operations, ie, magic rings are a waste of time. Simple features have about a thousand options, which make the learning curve too steep to hang on to. Just my 2c, take it as it is, 2c.