John Fwrote a review of Cutter Master Commuter U-Lock on July 14, 2013
Familiarity: I've put it through the wringer
This lock does a great job for quick commuting around town on an inexpensive bike. Even though it's a U-lock, it's not unbreakable by any means! To see if it's possible, I have gone ahead and opened mine up with a bic pen. That means that anyone familiar with breaking into bike locks should have a pretty easy time nabbing your bike if you're not careful!