Its a nice app...

My first experience with 3D was with Bryce 4. It was very easy to get results. It was designed for terrain though, so it was limited with modelling and similar. At least booleans worked (I'm looking at you Maya), and if one tries, one can get some decent results with cubes, spheres, tori, pyramid and cones (the user's manual had examples of a tower and the Pharos? lighthouse, at least in V4).

Its probaly used for hobbies, there are plenty of renders made with Bryce on the Internet.

And as Jay said, its good for creating panoramas of skies (Quicktime VR I believe it output to) I really liked making skies... I made hundreds of them... :p

So much fun!