Yes it does work well as used for a while in London. Basically you only loop your lock around the other lock so prevents the bikes being lifted induvidually. As it's only through the lock it has no detremental effect to yourself getting your bike out.

What more do you need to know/ unsure about.......it works!

Single bike = simply to lift into a van
Daisy chained bikes = difficult to lift meaning scumbag moves to another bike