Youtube, Chanel is "Canadian Precision Shooting" there is both french and bad english content, be advertise.
Vidéo of the results wont be ready until couple of weeks tho, there is about 60+ hours of footage to be analysis to get all the data.
But I can leak some results on the cone itselft if you dont tell anyone else.
1- cone reduce by A LOT the blast to the shooter. Actually, it redirect all the flow from the first baffle to the front at about 45deg angle. Wich also catch the blast of the other 3 ports that wont go into the shooter s direction.
2- you lose A LOT of the recoil reduction. On my bench it almost double (number to be officially confirmed later) the recoil observed when you add the cone.
3- conclusion, the cone have been made for a really specific job, to reduce the concussion, where you will also lose the benefit of à high performance brake, making it an average performance brake. *i would say its usefull for hunting or people who dont want to buy a second unit but dont want the blast while shooting all day.
4- yeah, it look as bad as what you can tell by the pictures.