This is a 13mm u-lock, which can be cut with only the biggest of bolt-cutters. The Kryptonite lock will do it's job best in relatively low-risk situations, for example, in the hall of your building, or somewhere, where you can keep an eye on your bike at all times.
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Pro For low-risk situations
This u-lock can work well in low-risk situations, or as a secondary lock to secure your wheels or seat.
Pro Keeps wheels safe
There is an included cable with the U Lock, that allows you to secure the other bike wheel (not locked with the U Lock itself), or the seat. This is great for city riders who have quick release wheels, as an unlocked wheel makes for easy theft.
Pro Relatively easy to transport
There is an included mount for the U Lock, which allows for one to easily transport the lock with the bike with no further equipment needed.
Con Can be cut with the biggest bolt cutters
Do not expect this lock to protect your bike in high risk situations (leaving your bike where there's a crowd, especially if your bike attracts thieves attention). The tubes 13mm diameter is not invincible against bolt cutters.