I've been away from Bryce for so long, that version 6 did seem new to me.  I had all the previous versions since Bryce was Metacreations product -- I think I liked it more then.  When version 4 came out I think I may have used it once, when subsequent versions came out -- well I don't think I used Bryce at all then.  I don't know what it was that made me get interested in Bryce again this time around - and I'm having to learn most things all over again. But I guess it was the $6 price.  I think many people will come back to Brycing as I have done.  I'm already seeing work from folks that say they haven't used Bryce for years!