Well, it took me several hours of work over a three-day period, interspersed with many more hours of reading manuals and tutorials, but I've finally produced my first model in Blender:
Most of that time was spent on texturing; I'm not 100% happy with it yet, but it's more or less acceptable. I think once I get a handle on some of the differences, I'll end up being able to model things much faster than I could with either of the 3D apps I used previously. For what it's worth, I think it came out much better than the communicator I modeled in POV-Ray.