Kryptonite Fahgettaboudit Mini

The 2017 Kryptonite Fahgettaboudit Mini is a top-end U-lock. One of the toughest locks out there, the Fahgettaboudit has been rated gold by Sold Secure, a bonus if you carry your own bike insurance; Kryptonite offers $5,000US with every Mini. Each lock includes three keys, one with an LED keyfob for you night commuters. The Mini is quite compact, at 83 x 153mm (3.25" x 6"), just wide enough for a parking meter. Weighing in at just over 2 kg (4.5 pounds), it's heavy for its size, but that's the price to pay for an 18mm-thick bike defense.
An excellent U-lock.