In the right hands, any of the 3D apps can produce great results. I remember seanr's amazing bridges from way back in 2003 and they looked really good - all in Truespace. The great thing about Blender is it has excellent functionality and is totally free and unrestricted. Some top notch looking stuff is being posted by blender users so its nothing to sneeze at.
thats a cool looking ship, great modeling and texturing! Conversions.... a tedious exercise in patience for a payoff that already occurred. Im in the same boat with some of my own models, and Im having a hard time getting motivated to revisit them. Its even worse when the app you used to make them becomes abandonware. Having changed apps a few times, and renderers a few times, Ive really come to appreciate how important it is to get your models in a clean and tidy state before calling it done.