I use SpaceClaim to design everything from simple plastic parts to highly complex mechanical systems. I still consider myself an intermediate user as there is much functionality that I have yet to utilize.

This software allows you to import virtually any CAD file into your CAD system, whether it was created in your CAD program or not. You can make changes, create drawings and export the revised file in the native format you need. Having the capability to modify any CAD file is huge! Can you imagine the time savings? Don't think of it as a replacement CAD software that you have to learn, think of it as an added tool which allows quick and accurate modifications to CAD files. We use this software in our service bureau because of the time efficiency for creating STL files for 3D printing. You can't beat the time savings of 50%!

This is my favorite material selection tool in ANSYS MDS.

It is quick and simple to put out production drawings and files for CAMing

The most 'non obvious' benefit was the ability to import a CAD file from multiple sources and save back out as a JT file in different JT standard release formats. This is FAR simpler than using many of the various translation tools we have to translate from CAD to a neutral format to JT.