Significantly better than the cheaper HB ones which tended to come loose for me, fits well on thick straps, and with the grub screws the nuts are sure to stay in place.
The locks are angled so that the strap can be connected to the buttons without pulling out the spring.
Only downside is that the screws themselves are attached to the buttons, so they can't be replaced by a screw that might fit better to existing holes.
Locks work with the buttons that the Harley Bentons comes with.