Just barely got it and started playing with it but I say yes.
The upgrade is just $39.95. That buys a couple of good meals out for two people or just over 5 full price tickets to the movies around here.
You get lot's more materials and primitives and I think the layout is better.
You can boolean bryce primitives collapse and save as a mesh.
It is faster.
It definately has more value than previous upgrades or revisions ( I think I paid about $50 for 5.5 for maybe 1/4 as many features)

Also, If no one buys the upgrade the intrest and support that DAZ expends to get version 7 out will drop. Pay a little now and keep things going.