Here are two buttons, both Delrin. Black one is still on rocket, so I had to X-cut paper to fit over it & blacken background so you could see the white one.
White was set loose to spin. Lasted one flight, other one of pair was so destroyed, only the screw and some remnants of button were left.
Black one has 3 flights on it, now falls out of slot, need to turn to fresh section. [ click 3 times to get full size]
These 2 rockets fly a lot on high velocity motors, white buttons were on an N-5800.
Black on rocket that flies mostly CTI White thunder and AT Blue thunder.
So there you go....useless after one flight & three. I think all this depends on your combination of rocket/motor & how high velocity is .
For me buttons are so cheap I just plan on replacing them.
Back to the OP's product, the outcome will be very interesting. I think for long-burns and most motors/ user's [ probably 98% ish], I think they will be fine as long as there are no issues with fins hitting them/damage. That will all come out in testing and any adjustments needed.
Extreme flights will probably still be done with towers. [funny ...you can tell who's done this stuff and who hasn't, by many of the comments]
It looks to be a great advance & problem solver for many & that's a good thing. I know would I love to get my hands on one, & will beat the hell out of it ! LOL:grin: