Years of testing and infinite discussions about features of Nano Pro, then a Gold Medal in London 2012 by my son with prototypes of the Extreme; the Italian team all using Extremes after then, as well as many other top level around the globe. And SST being the only real alternative to ACE's.
CE Mission was to make the best possible arrow for recurve shooting, and they have been very close to this, and for compound as well ( and they were already at top for it)
Incredible waste of a multi-year investment that was finally ready to give some return.
The few times my daughter still shoots Olympic, her SST 1000 remember me what they were and they are not anymore.
My daughter also used their SST 1000's to great effect. As someone who was possibly the earliest adopter and advocate of the Nano, and who shot >340 in competition at the 2012 Olympic trials with the Extreme prototypes, it is incredibly sad that CE abandoned this effort.
I will never forget showing the NPX prototypes to two of the top US compound archers in Louisville in 2013, only to have one of them (you can guess which one) scoff at me and say they would NEVER shoot a NPX over an X10. Then, all of the sudden, guess what they were shooting. LOL CX had in fact cracked the code and made an arrow that could not only compete with the X10 but in fact, beat it. But even that wasn't enough to overcome the deep pockets of the 500 lb. Gorilla that has run this sport for nearly half a century.
After dropping a few pounds in weight, I switched back to A/C/E's for outdoor, but my PB 70M scores and three national championship barebow titles at the 2015 Outdoor Nationals were all shot with those prototype NPX's. I still shoot CX's indoors, when I have the chance to shoot, and will be sad when I can no longer use them.