Hmm, the only main difference that I can decern between B5 and V4 is that Vue renders much faster, with the same quality as Bryce 5, and that it's majorly stable over B5. But as for the B5 treelab and network render. The only plus I can see for B5 is the network renderer, gosh I wish Vue 4 would have that, as well as true support for Multi-processors. Mind you, this is the PC version of B5, not the Mac version. I heard that the mac version is much more stable, and it is not a memory hog like the PC version is.. ~shrugs~ The only other major difference that I see is the Interfaces. Bryce's interface seems like it was created with children in mind. V4, appears to be geared towards professionals. However, I do like my B5 for it's ease of use. Vue D'Esprit 4 = Around $180 (full) Bryce 5 = Around $300 (full) B5 has the feel that it is still in Beta (ie, still lots of bugs in it), Vue 4 almost has the same feel as well. So no difference there. If your looking to save money, and fast rendering time with no affect on quality, go for Vue :) If your looking for a low learning curve and have either 1> tons of high end computers (over 1ghz) for network rendering (saves lots of time), or 2> a few days for render time on a single computer (500 mhz to 1ghz), Go for Bryce 5 :)