They're worth every cent. Just had a thought. I havn't tested Lightning yet but if it's multithreaded as much as Bryce 6 is now you'll get a bit of speed increase off of using it on a dual core as well. Very nice. They are saying that further mutlithreading optimizations are coming in the free update 6.1. Looks like they're starting to make a new base if you will to build future things on. Very good to see.