We ditched all others and just use Inventor at work now. Also Little Spinner 3 was designed roughly on inventor, Yes the newer ones need a very high performance graphics cards (£400+) to work well but the older ones like 2008 are better and I have this running quite well on a laptop. The Design Accelerators help when you dont know much as you should for certian things. For example you can just say 2 centers and the power and speed and it will size chains and sprockets for you and then draw them into your design.