Good: 

Ease of use with several drawing tools.

Bad: 

Some vector typical features are not available such as boolean operations, such as add, substract & join. The variety of software is not sufficient. Application development seems to have stopped in 2012, no customer support.

Bottom line:

Not all operation in Expression is straight forward, there are some feature that require extra work to apply. It appears simple, but you need to dig deep to get what you need.