Not as large or grand as the National Palace Museum, this museum is by no means a must see, however there is still plenty to see here if you have time.
Exhibitions change regularly so keep an eye on their website if there is something that you really want to see. Recent exhibitions of work by Van Gogh and Zhang Da Qian have been extremely popular.
The museum offers guided tours upon request (or you can join a scheduled English tour at 3pm daily). They also have a new wireless guide that you can access via your phone.
If you are in the area, you may also want to visit the nearby botanical gardens.