CAPTHOWDY did a comparison of a km to a nammor
From what i read about the nammor the stem is made by km(not sure the truth on that) i read it on the forums somewhere.
as for the chiller; i smoked last weekend at a friends place with and without and honestly i couldnt really tell. From what i heard it all depends on the person using it. my friend got a hookah with the chiller cause it looked cool.
But they are right no matter what you pick get a washable hose.