I like that it allows me to quickly model something in Solidworks or other software using their API's without having them develop an addin myself! It would be nice if they had more 3D models available but overall so far its been great!! The best thing about this program though has nothing directly with solid works - Its how easy you can go back into your original file after exporting all changes out via MCS (Model Center Server). You don't have as much control over what happens when going between files unless there are separate instances open at once which may not always happen depending upon computer specs etc..