For the actual interface with rifles... They don't fit as snug on the mount as my SF cans do. Sometimes on SF cans you might have a tiny bit of play, which can usually be fixed by taking another crank on the locking collar. With the B&T mounts, no matter what mount I've put them on, there's a slight amount of play when it's cold. As it heats up, it seems to be reduced. I'm guessing with more carbon build up, that will help, as well. Either way, I haven't found that play to affect accuracy, as the groups have stayed consistent across multiple rifles, on both the 7.62 and 5.56 side (I've only shot the 7.62 can on my SR-25 APC to date).

POI shifts vary. On my M27, the POI shift was only about .3 mils down and no real windage adjustment that makes it worth worrying about. Grouping was unchanged, with both groups being amazing from that barrel.
I tried POI checks on two other 5.56 guns and had mixed results. One was on a closed-tine Warcomp (SOCOM mount) and it was noticeable, but nothing beyond what you might expect from a SF can. The other mount I tried it on was a SF legacy brake. It ended up having a 2" POI shift to the right at 100y, which isn't really practical, but I can't fault the can or hub since it's not even designed to work on that mount. I just tried it to see what would happen.

As for flow-through performance, I didn't really notice a difference on the 7.62 can on the SR-25. Both with and without the B&T, I would get a little gas. With a full-size SF RC2 7.62 can, it seemed like I also got the same amount of gas. Since I was sending dollar bills down range, I didn't do a ton of shooting with it. I need to take out some cheaper 7.62 to do more testing.

On the 5.56 guns, though, it was noticeable. On my old school Noveske N4 (not a gassy gun to begin with), it was like shooting a .22LR with zero gas. On the M27, the gun's recoil impulse was super pleasant (more so than unsuppressed) and no added gas. Same with the two other ARs I tried.

For the hell of it, I also tried running the can on my 416A5 clone on the suppressed setting and that was fantastic with no malfunctions. That gun needs more testing to fully trust it, but it didn't seem to struggle and all the brass fell at the 4 o'clock. I didn't do any POI testing with that gun (yet).

From behind the gun, the sound was pleasant. It didn't sound terribly louder than any other can, despite it being flow through, but I'm probably not a great judge of that.

Overall, I need to put more rounds through these, but after the fixes, they seem to be performing well. And I guess I finally need to break down and put a SOCOM mount on that rifle with the legacy brake because the light weight of the can matched with the great performance of that rifle would make an already great competition gun even better.