After viewing the Otis Technology blerb and David Tubb's Final Finish, I have come away unimpressed, particularly pertaining to the claims of increased barrel life. Barrel life is subject to the flame temperature of the burning propellant, which occurs under great pressure at the throat of the barrel, combined with the rate of fire of subsequent rounds. Passage of the bullet is of lesser concern. I can see how a slippery finish might produce more uniform muzzle velocities, and reduce jacket fouling, which is why I use Microlon, but I fail to see how a claim of improved barrel life could stand up to scrutiny.
These products might be attractive to those who shoot with factory barrels, but I don't see how there can be of much benefit by the use of these products to the shooters who have chosen to invest in top quality match rifle barrels.