Weight 122 grams / 142 grams (110/130 BCD). BCD 110 or 130 mm. It works with traditional 5 bolt chainrings from most manufacturers (not compatible with Campagnolo chainrings).
It's simple. It works. The accuracy is within pro peloton specs. It looks elegant and works perfectly with my Specialized Tarmac. It connects to Bluetooth and Ant+. If you've already got your crank, you simply swap out the arms. You can adjust rings and/or length of the pedal arms.