Thanks for the opportunity to see what else is new in commercial NURBS products. There really is a natural root-difference between vector and raster design approaches. ZBrush is an ideal partner for pure vector applications, (including NURBS).
I'm a dedicated user of muiti-versatile-vector-based formZ. Have been so for 12 years, or so. (The only 3D program I know well). I doubt i'll want to learn much more interface juggling. In fact i'm waiting for the ZBrush to upgrade before delving deep in in to it's interface. (May I hope it settles in the interface for some time to come. That's due to human brain limitation. We mortals are really frail when it comes to accommodating too many diverse interfaces of life. The artist faces ample hurdles to creativity, let alone interface. Youth may be swayed by claims of skill without work, but beware. (I know, I got into Scientology at age 18, far from home. They swayed me with the idea of "total control over matter, energy, space and time, etc" Ha, what a delusion).
I realize that we have to thank the game and movie industries for 3D development, but the bigger promise of 3D is for all industries, even ones which make entertainment possible at all. One has to find their real goal in 3D before diving too deep. Shallow dives are OK, but for those of us who need to earn a living with dependence on 3D, dive with care.
I've tried hard to invest in software which would last but still wasted money along the way (on software which really had little hope of market growth). Competition is tough. Softwares promises look good on the surface, up until you invest deeply in time and creativity. Then you find the bugs or limits that kill your hopes. Unless you have a software which has developers on hand to fix the bug. That's why I would stick with better established softwares with a real user-based income. A $100 isn't going to solve the gaps which an avid user will find. They all run into bugs because 3D is infinite to the computer, (a fact brought by evolution). Furthermore, let's theorize that rising markets like China or India would rush to support $100 NURBS aps. Now you have other interface problems, human language and cultural accommodations. Besides that (and piracy), you have too many broad interests to serve. Each user has such varied needs in 3D, even within one nation.
I'd expect to spend 4 figures on a long lasting 3D ap. My ap, formZ has free demos for the starving artist to try. Besides one can work their way up progressively. Employer's software is another route to master established 3D and another is ebay deals on good ap licenses, (used copies- but check validity).
I won't bore you with the countless customized needs one may have. Except one should pick a Swiss army knife if you realize the importance of versatility. NURBS alone is not enough. Strong polygon geometry is still super hot. So are the crushing expenses of survivable rendering, vector-animation and strong import/export. Ver 6 of formZ does it all.