Personal preference, I looked at them at the Elex show on the Wago stand and just dont like them.
I have various sizes of screwdrivers with me, but not slim cable ties. Having a screwdriver with me the cable restraint will be tightened up, having to go get a cable tie from the van or wholesaler as not everyone keeps thin cable ties on them, I am convinced that they wont be replaced by some people. Also if anyone came across one for the first time on an installation and a cable tie was not present, would they just think its a poor design junction box?
For now I will stick with the Hager ones, maybe in time I may change my mind.