Where are you locking up your bike? and for how long?

Yes a solid steel U lock and a meter of hardened steel chain will be heavy.
worth it to not have your bike Nicked, your call ..

I recommend the type of chain with the links made out of square steel,
they are harder to cut with bolt cutters, than common chain made out of round steel,
and I recommend that over any cable used to lock up your bike

I use a Ring Lock, AXA defender and the lighter 1.4m chain that they make to combine with the wheel lock
attached to the frame.

But Im not in a high theft city , and I have solid stuff to lock my bike too ..

Cables only for quick trips into the shops, secured by Padlocks..