Hi all, I started playing with Bryce and have since moved on to Vue.  I don't pump out pictures very quickly as being a father and husband has a way of keeping one busy.  That said render times are getting shorter latley as my workstation technology gets better as well as my understanding of the programs.
Bryce is a great learning tool for budding 3D artists, its simple, free, easy to use, and imports many different file types.  But as I used Bryce more I started to get frusterated with its limitations and eventually jumped ship to Vue.  Vue also has a free version and is alot more in depth. 
I hope you enjoy my art.
-Luke