Been looking for another regulator and was wondering your thoughts on the new Atomic Z2. This is the second generation Z1 with a different second stage casing that BTW looks identical to the B2. According to the LDS it also breaths just like the B2. I was told that the main difference between the two is that some of the second stage titanium parts in the B2 have been replaced by Zinconium plated in the Z2. I think the same is true of a spring and possibly other parts in the first stage. The Z2 is also missing that cool hose swivel that the B2 comes standard with but it can be added at any time as an option. The warranty requires 1 year service instead of 2 year like the B2. I'd be interested to hear from anyone that has tried both the Z2 and B2 or that knows more about the Z2 than what I have already stated. I don't think it's been tested by any of the magazines yet since it just hit the market a couple of months ago.