The user interface is very simple and easy to use. There is nothing I dislike about this programme at all! As always with any software or programme there are bugs but when it's been fixed we have no issues using this again. The price is also great for the amount it covers and everything in the package is a must have for all designers. It allows us to create realistic aerodynamic shapes. Before this was done by hand and it took a lot of time to finish. The user interface makes it very easy for beginners as well experienced users alike! I love how intuitive this software feels when you are just starting out with your training or learning new things about engineering/manufacturing processes. There's nothing that i dislike at this time. This program works great in my line of work (CNC machining). We use it daily because we can simulate our products before they're even built!