Here are some pros and cons:
+ Design
+ Material
+ Haptics, keystroke
+ Two additional USB ports below the keyboard
+ Relatively easy to maintain, in spite of the white keys
Not illuminated keys -
- Not available with Bluetooth, such as the 'small' keyboard. The cable is disruptive and does not match the minimalist design.
- The 'cable reinforcement' on keyboard output is not processed and made unpacking Like Apple has been a buckled impression. This is for example. the Macbook PSU solved much better and more stable.
- Noticeable smell (softeners in plastic?)
- Happiger price and almost worthwhile in AppleStore 'live' to buy.
For durability, I can not say anything, but since I do not write a lot of text, I'm less worried since.
Strong buy recommendation for anyone who needs a numeric keypad!
Supplement: Unfortunately, the keyboard also secretes after weeks of a strong odor. Has indeed been eased, but still noticeable. Since I expect from Apple better quality control, especially as the fumes are not healthy determined. Let's see what Apple says about my complaint ...