For the money, Bryce 7 has some nice new features, but in duo's defense, it is buggy and does seem to require a powerful computer to do some of the same stuff that was already there in version 6.3.  I have not tested it extensively, but so far I have found these problems when running it on my machine (which is not new, but not a complete dinosaur, either):

It is impossible for me to import anything but a fairly low poly item through the DAZStudio bridge.  Any human figure I have tried (even nekked ones with no high poly clothes and hair meshes) will not fully import and cause Bryce to freeze up and stop responding.  In B6.3 I had some problems with the bridge, but overall it functioned much better than in B7 Pro.

I love that I can set the intensity of the sun in the sky lab, but I have found that after I make a few changes to the scene, the sun intensity resets itself to the default 100 setting.

And, with terrains, if I go into the Attributes box and reset ANYTHING (size, boolean functions, "hide", or anything else) the terrain jumps back to its default location and any rotation that was done is also lost and reset to default.

Am I the only one having these issues?