Generally speaking, security is a balance of locking device's and convienence . Your chain looks pretty good but the mono-block? (not my first choice,or my second)

While some may find one hand operation without the key easy to use there is a another side to the story. Specifically, If you need the key to lock your padlock you can be assured you had the key when you locked it eg. you go out lock your bike, when its time to go home you realize you do not have your keys.....did i lose them? or leave them home? did i have them when i locked the bike?. As a result, you are now stuck with your locked bike and no keys.

Secondly,The Abus Monoblock comes with regular keys. Anyone can make a copy for a buck if they get their hands on them. Very poor key control.

Thirdly, the lock could be picked and bumped but my method of choice would be just to drill the sheerline. Cordless drill couple seconds and your done.
http://www.youtube.com/watch?v=zwmGzIFN5wo
http://www.youtube.com/watch?v=XY6VKMUsaYU

Finally, the availablity of good locks are hard to come by and can be even more so if you don't live in a large city. I am particular to high security locks and but there is no debating their effectiveness in situations that i encounter on a daily basis.

Good advice found here....http://www.youtube.com/watch?v=Den2T...eature=related