Cis Mk6, when it arrives and aimed at the recreational depths mentioned....
FWIW I have a bad back, not that bad mind you... on bad days when diving I've finished kitting up in the water, your weightless so makes no difference! That was in bad old OC days with twin 15ltr backgas and two side mount 10ltrs- ouch
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Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM!
Beware Fridge Suck!
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