Talked to Frank Proctor about it, nothing but positive reviews and has less noticable wandering than standard LW barrels. Would love to get my hands on one, but don't feel like buying the complete BCM upper just to get the barrel. The theoretical underpinnings of the barrel contour design are solid: with a tapered outside diameter, the barrel would be stiffer and have less muzzle whip than a barrel with the same mass but a gov profile design or even a straight contour. The fact that Proctor reported back superior consistency at ranges seems to prove that theoretical underpinnings... but i'd love to verify it myself.
I honestly would not worry about suppressor causing premature barrel failure for the following: suppressed weapons aren't meant for large amounts of fire. With gas blow back and heat mirage, suppressors are definitely best used in a semi-auto nature. Furthermore, as has been demonstrated through destructive testing, suppressed 5.56 uniquely has a practical volume of fire limit. With a relatively large amount of copper jacket/bearing surface to a small lead (or whatever alloy they have in M855A1) core, after 90 rounds full auto the core will start melting, resulting in unstable bullets and baffle strikes.
I think people over think barrel profiles most of the time: let's not forget gov profile is basically the worst possible barrel profile design... but it does just fine for 99% of applications.
Other than the BCM ELW barrel, i've also been intrigued by the Hanson profile barrels at Ballistic Advantage. 4150 CMV, Melonited, designed specifically for optimized harmonics. For one, they are huge advocates for shorter gas systems with optimized gas ports. One thing I heard from Denny over at GTS (ahhh, the good ole days) is that apples to apples, shorter gas systems seem to have better accuracy. I suspect having the gas block closer to the chamber reduces the amount of flex forces during firing