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harry,

the gas separation and rolling are both hogwash.  some idiot came 
up with that and more idiots followed afterwards.  the gas is 99% 
mixed and homogeneous as soon as you pull off the fill whip. 

the only concern one MIGHT have is with helium fills that sit 
around a long time.  the helium molecules may find a way out of 
the cylinder.  if you analyze those after you fill but wait a 
while to dive the mix, analyze it again before you dive.  the 
seals weren't designed for the smaller helium molecules.  this 
may be a serious over-exaggeration, but it should be your only 
concern.  

one may ask what the difference is between scuba valve seals and 
helium (cga580) valve seals on a dedicated helium cylinder.  the 
difference is that nobody in the gas industry is going to end up 
dead or bent if a small amount of helium leaks out of a helium 
cylinder set up for normal use.  

safe diving,
scott (chemical engineer)

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