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I have been cave diving with tanks back mounted and upside down
for some years now. They are independent systems and I use them
in the ocean now as well. There was a time I did deep dives with
a single tank and now I think I must have been a bit of a dill.
(No comments from my friends please)
 The change to upside down is a complete success. The hoses
do not get caught and can be neatly run along the sides of the tank
held in place with a bungy cord. Spare air in an emergency, (which
I hope to never experience) is available from either reg on a very long
hose that can be even longer since it trails from the bottom of the tank 
instead of the top.  With the valves at the bottom they are easily
turned on and off.  I used to always bang my head on the valves but that
 doesn't happen now.
No longer do the valves gouge on the roof of the cave.
With the valves on the top they can get snagged in the dive line and
you are dependent on a buddy to sort out the problem.
On the bottom (for me) they have never  snagged but if they did
 you can reach the valves and sort the problem out.

Disadvantages are you need extra long power inflate hose.
I think that extra long pressure gauge hoses might be good but
I have not hasselled my dive shop hard enough to get them for me.
I can probably live without them but eventually I'll change.
You can just drop the tanks when you take them off and its a problem
free standing the tanks on the valves to put them on. Most I put on
and take off in the water.

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