But the build quality is excellent.

All ABUS product ARE good quality and well made product

Weight is, of course, an inescapable reality of any lock that provides much security, and this isn't especially heavy for a good quality lock - my Kryptonite Evolution

It has the great quality I have found in all Abus products

Really well made and high quality.

The Abus Bordo 6500 aka Granit X-Plus is a less common style lock, designed to be nearly as strong as U-Locks but without the limitations

would be that both old and current designs are much more flexible than any standard u bolt and more secure than most any cable.

Maybe not quite as secure as high U locks but certainly a lot more practical with the carrying case that can ether be strapped on or bolted directly to the frame where the bottle cage goes

I would feel confident in using this over those stupid clumsy U-locks which are so frigging huge and heavy (this is 4.4 lbs