Aye, I've used 3, 4, and now 5, and I currently use Bryce 4 at work (in my spare time of course! HAH!) and run Bryce 5/Lightning at home, and I totally agree with Eric. The Material Lab for example is nearly identical in 5, 4, and 3, so I find myself making textures at work and e-mailing them to myself for home use. I've found them both (4&5) to be nearly uncrashable; although I heard that 5 was unstable before the patch, I never used it without it. If Corel wants ME to buy Bryce 6, it better kick ass. Big Time. I found Terragen a joke, and Eric you silly monkey, one doesn't "move on" to Universe, that would be like "upgrading" Bryce to Photoshop! But still, Lightwave is in the trees, the air I breathe, calling my name...