This tool is improving rapidly. I found it very frustrating when it first came on the scene...much improved now.
One thing it could really use is keyboard shortcuts to reduce how often I have to move the mouse around from my work over to a menu or the cube, zoom, pan, etc.
An example of this would be to have the space-bar act as a quick way to move from normal mode to pan (hold space bar to pan with mouse).
Another example would be a simple configurable command/control key to zip to a particular saved view
Many graphics tools (like photoshop) allow use of un-modified keystrokes to do frequently occuring things whenever you're not in the text edit mode. A simple tap on the T key could zip you to "top" view. Z key could put you in zoom mode. N key could put you back to normal mode.
In short, using the product has improved a lot, but it is still missing these sorts of "speed of use" features that have been industry standard for many years in this and other creative genres of software.