I recently had to replace my bike lock and I noticed Target was having a sale on all their Schwinn accessories. I found a 6'' cable lock that opens from a combination you are able to set yourself. So far I have been pretty happy witht he lock.
The lock comes with a mounting bracket that you are supposed to be able to mount to either the frame of your bike or your seat. I tried mounting this and when mounted, it moved around too much, thus it was not a good idea to have it mounted. I then simply wraped it around my seat and that has been a fine place to store it.
The lock itself is pretty basic in construction. I know it is not as effective of a theft deterrent as more expensive locks, but it should serve my purpose. It is my theory that if someone really want to steal your bike, they will do so. A lock, any lock will make them think twice about taking your over one that is not secured at all.
I like the cable lock more than a U shaped lock, because I can secure more than one bike and even the bike trailer I have to pull my daughter. The length of the lock comes in handy.
This is a decent lock for the money. It is not a top of the line lock by any means, but I thing...and hope it will do the job.