This is quite a bit of info in the DT Club
( This thread )
https://forum.dangerousthings.com/t/apex-flex-preorder-for-dt-club/12058
and publically here
Basically, ( Roughly) the antennas worked well and as expected, however, there were a number implanted on the knife edge of the hand and due to solder ball issues and the flexing in that location, some of the chips would seperate slightly from the PCB antenna, causing relibility issues.
The design was re-jigged and stress tested and now they appear to have passed vigirous testing, proving to be more robust, possibly including robust enough for a “JUDO CHOP!!!”
