I got the hoses in the mail today. They come with an instruction book that answers the question about longevity. I'll take a photo and share the English part. In short,
the instructions specifically say the hoses should be replaced after 5 years or 500 dives. That makes the discussion about whether miflex branded hoses are better than generics in this regard or not completely irrelevant.
I was also surprised to see that it specifically says the hoses are not suitable for o2 concentrations over 40%. I guess I'll take that miflex hose off my deco bottle!
The red circles were added by me. The third one pretty much tells me these aren't suitable for cave diving at all. Unless it hasn't been wet yet, cave gear is going to be scuffed to heck and back. Actually, I'd say that means
Miflex-XT Tech hoses not suitable for any kind of technical diving at all. What a disappointment. I think regular Miflex-XT may be still okay, since scuffing a hose without the "rubber" exterior would be far more difficult.
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I think I'll continue to use miflex for recreational diving.
...and.. LOL! An instruction book for a hose? I got a chuckle about that. Given the fragility of Miflex-XT Tech hoses, it must have been necessary.