Why invest in Workplace Superannuation?
If someone else contributes (government or employer) then superannuation schemes can be fantastic. Compulsory Workplace Superannuation is only a matter of time. It provides a great way for employers to keep key staff.

Why not invest in Superannuation?
Superannuation schemes can often not be redeemed until retirement. 

KiwiSaver
I have broken down the categories of possible investors in KiwiSaver more...