Seems like the "Ex-Apple Engineers" is prominently used as a marketing. Some review online goes on saying "Made by Ex-Apple engineers and it shows"

But who were they at Apple and what did they do there ? Does Apple endorse them in some fashion, do they have privilege access to some technologies ? In what fashion is that relevant ? Outside that branding, there is nothing in there that back that claim with anything concrete.

There is nothing wrong and the application can be indeed great, but this marketing tactic raises all my alarms. Without the positive comments here on HN, I would not even have considered trying that product at all.