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The pocket rocket 2 is much smaller than the version 1. And the build quality it's still rock solid. There is an even smaller stove that you can find on amazon. It is made in China and gets fair reviews. It is much cheaper, and my friend has one but the build quality isnt as good as the msr pr2. He never had a problem with it but some of the reviews have said that the metal will bend/warp over time. 
My vote still goes to the msr pr2. It fits perfectly inside my titanium cup along with other parts of my kitchen setup.