They have been independantly tested in Germany on a manufacturing rig and withstood the same pressure test as an AP caliper for the same length of time (if not longer)

Some of the others failed at much lower pressures (not naming names).

Thats how these things are tested in the real world.

There is a vast new range of calipers ready but maninly not being released until these tests have been completed.

AP have had a namehold on the market for years, If you can afford them then for sure buy them, but there are comparable products out there that will do a similar job at a lower price.

Remember the pad does most of the work if you put the same pad in some calipers IMHO you would not know the difference.

AP people with a pride for the name will disagree.