Cool. Someone that knows what they are talking about.
Now if you could post your findings on reflectivity of used mylar (with the obligatory water spots, scratches, folds...)

Also, since you obviously know people and things, perhaps you could post Mylar's effectiveness when using CFL's or fluoro tubes.

I've never read Cervantes that I know of, however, the main reason I personally recommend flat-white paint...is that 99.9% of the closets in the USA are painted flat white already, and most gardeners do not need to be so anal and misguided that they demand an unnecessary product just because an acquantaince of Crevantes recommends it.
I also recommend the flat (satin) finished side of the bathroom panels, because the shiny (glossy) side disperses the light unevenly. Regardless...my guess is that the lumens gained by purchasing shiny reflective material is not cost effective, nor does it even help in some cases. (CFL's and fluoro tubes, for instance)

Do I hate you...? No. Do I trust your insight...? No, not yet. But then we haven't read your test procedures or results yet either.

Keep in mind...it's not our job to blindly accept your rather bold claims. But it is your job to back your claims with actual proof.