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I've seen all of them gamed and the only one I could recommend for performance is the KJW.
Its really gas efficient even with a CQBR barrel. If you ran a longer barrel and adjusted the power down it would be even more efficient.
The couple I've seen could do 2 50rd mags on a single gas charge in 10-15c weather. Both functioned down to 6-7c with little change.
You do have to take the bolt out to do velocity adjustment, I'm not sure how that compares to the WE. The adjustment itself is with shims so it's really consistent at a given temp.
Best recommendation is to read the 9 page thread on the KJW here. There are proponents on both systems (and the WA) but the only person I've known who has owned all 3 is now running only the KJW.
-Grant
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