I got hold of a free version of Rhino from an old copy of PC Format years and years back. But i could never get to grips with it. Just goes to show, everybody has their own preferences and not everythings better or worse.... (except sketchup
)
I wholeheartedly disagree there.

Sure preferences and experience plays a part in it, but the capabilities of a modeller app
are measureable. If one app can bake textures and ambient occlusion, unwrap the UVs of a model, create particle systems, duplicate selected parts of a mesh within an object etc, and another one can't, then the modeller that can't is simply an inferior tool. I know how to model in both applications, so the differences are plain to see. No amount of work in truespace will give you the ability to bake textures for example.
If I were a truespace user it would have been completely impractical for me to model the HTL Aten, or any other ship with irregular curved surfaces. I remember Nuke saying that he used to have to make curved surfaces in TS by entering co-ordinates for each individual vert in a surface, which is about the absolute worst and most hair-removing method you can possibly use, and it's far from the only thing that TS makes far more difficult than it really is.
By and large TS is simply a primitive modeller\animator. It's not designed to be able to create complex technical objects like ships. If you want a weird proof of that, search in google for 'modeled in truespace', and compare the image results with the ones you get for 'modeled in blender\max\maya'. There are a few nice TS models, but the results from any of the other apps blow the TS ones out of the water. Why? The other applications are quite simply much more powerful tools.