I was getting sick of not having a numeric keypad so I picked one of these up at an Office Depot. Setup was very easy out of the box and paired with my MacBook Pro just fine. Just remember to flip the switch on the back to Mac On and press the pairing button on the back. And on your Mac when it tells you to enter in the numbers to pair, put the keypad into KEYPAD MODE by pressing the CAL/KP key on the unit. Took me a few minutes to figure out because I was too lazy to read the manual!
It’s pretty stylin’ and fits right in with the other Apple input devices. Very useful function-wise if you crunch a lot of numbers especially on Excel spreadsheets and looks pretty slick as a solar powered calculator.