James I don't think there's much difference in the weights to be honest. Though some are a little smaller in size, and therefore might be lighter. They're all so similar, as the design is copied exactly from one company to another.
If I was flush, I'd get the Xena alarmed U-lock, which is made of stainless steel. A good two-in-one design IMO.
EDIT: Fark!! Scoble got there first! ;)
James I don't think there's much difference in the weights to be honest. Though some are a little smaller in size, and therefore might be lighter. They're all so similar, as the design is copied exactly from one company to another.
If I was flush, I'd get the Xena alarmed U-lock, which is made of stainless steel. A good two-in-one design IMO.