Reasons to like Curvy:
1- Can I run it? Yep... Curvy runs on nearly anything, doesn't even need separated ram. Desktop, Laptop, Windows Pro Tablet... it doesn't matter (This benefit probably requires the UI to be barebones.)
2- What are licensing restrictions? None. Short of trying to sell Curvy's code, UI, or pictures associated with it... the License is quite friendly. If you can make money commercially with Curvy, then do it. There's no cap limitations.
3- It has a Wine option for Linux users
4- It has increasing and decreasing geometry tools in fractions.
5- It is the only 3D program that is ready for 3d work in 4 seconds on my laptop
Reasons not to like Curvy:
1- You don't own a tablet
2- You can't draw well enough that other people know what you are drawing
3- You wouldn't watch videos on how to use this software unless it would keep a zombie apocalypse at bay.
4- You don't like drawing living things
* a 64 bit version is now included, so the million count issues should be a thing of the past.