This is a terrific drawing/modeling program!
However it is very large app, and I found the InfiniteSkills training to be essential for learning all of the hundreds of things you can do with Rhino.
Also, make sure that you have the latest driver(s) for your video card.
I use it for generating CNC parts.
Rhino technical assistance was very helpful in getting my problem with my video worked out.
Overall, a great experience.