This was one of the reasons that I chose against the Meg. I think the unit has tremendous build quality, adn a number of other nice features, but given the post, there is opportunity to look at both sides of the coin.
I am a strong proponent of ALL rigs following the 'rich on right, lean on left' mantra. Standardizing this, both OC, and CC supports our intuitive actions when switching from unit to unit, and mode to mode. That being said, the O2 button on the Meg is on the 'correct/right' side IMO. However, I dont like that it is on the inhale side of things. Moving it to the other lung, again IMO, complicates things as both manual adds are too close together. May not be an issue for the diver, but for a diver rendering assistance that isnt familiar with the unit, herein lies an issue.
My thought on adding O2 on the inhale side is of mixed opinions, but its mixed enough that I elected not to go with this route until I see some better data out there. My rationale, in general, which is only supported by hypothetical data, is that both gasses should be injected pre-scrubber (although controls should be on rt/left respectively) to aid in mixing/blending through this 'turbulence', and then pass over the cells. IMO, in ALL units, the cells should be the last thing gas passes before it enters YOU. This isnt the case with a number of units however (so I built my own
). Now of course there is a gap in this arguement as wel, that being that cells response time is relatively slow and they may not be caught up with each breath...but then this is an issue with all units anyway.
my $.02