Ive used this lock for several months now. heavy duty and easy to use. it coils up around the top tube of my bike when I'm not using. I would recommend if you need a bike lock.
With its coil up style it fits well under the seat or on the down tube with the clamp that comes with it. This lock may not stand up to the pro theives out there but it will keep your bike safe for short term stops and high traffic areas.