Hiya,
Very sorry to here about your loss, must have been something of a shock?
I'm not going to comment much on the depth issue. I get
everytime I say- "the manufacturer only rates it to 50mtrs so thats all you should dive it too" because lots of people here dive them deeper either in countries where the law allows them to still get insured and do that or they don't have dependant relatives to look after should they die or get bent out of a shape while uninsured!
From a technical standpoint the general concensus is that it'll work deeper than 50mtrs but beware the small scrubber...
( "beware the small scrubber" ??? Sounds like something from a Welsh theatrical production!
)
The ClassicKISS is an excellent unit, only slightly more money but with a proven track records to the depths you mention, technically its almost identical and maybe more suitable for you?
Monitoring the PPO2 Displays seems like hardwork to start with but you very quickly get used to it in my experience... anyway, even on the "more expensive rebreathers" I believe vigilant monitoring of the displays is still highly reccomended, some might say an ECCR is more likely to screw things up quickly than a KISS style CCR but that would be somewhat biased of me to say.
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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!
www.hugsac.org.uk