The data is limited, yes. However, according to this test, it filters significantly more from 20-30 mu than the Wix XP. Maybe that's not saying much due to the comparatively better performance of others, but it is a data point consistent with what I said: Boss has better performance.
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There was also some recent empirical testing done by BrandRanks which is also consistent with this. I won't post the full link because I refuse to defend their methods. I specifically said the testing I have seen recently shows the Boss being better. Please note that this statement is true regardless of the validity of the testing. So, please take it for what it's worth.
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I'd love to see a comparison between the Boss and standard Wix and Mobil 1.