Really? how do you know that they're all putting out "40mw"?
I've seen atleast 5 members here say theirs is overspec, and the only bad thing I've seen about one is some noob pot modded his, and it died. I've also seen one outputting over 70mw, and one at almost 100mw... Why do you assume they're all 40mw? A few might be underspec, but I think the majority are actually at, or above 50mw.
I dunno bout that, but the 5 to 10 people told me it was in the low 40's