Ah yes Gator, that would be the hysteria I mentioned. The tank involved in that explosion was 6351 alloy, but the tank and the alloy it was made from was not the cause of the accident. (Although that whole thread is interesting reading and kinda makes the whole hysteria point given how many people immediately speculated about the accident being due to the 6351 alloy.)
Fact is dropping a 300 psi tank with 98% O2 in it is just a really bad idea regardless what metal or alloy it is made from. It's one of those things you just don't do like heating your AL tanks to 400 degrees, doing massive overfills, using double burst discs, leaving an inch of sea water in the tank, skipping hydros and VIP's etc, etc, etc. Luxfer is responsible only for their tanks, not how the end user abuses them or mis-uses them.
I'll stand behind the statement that less than a dozen 6351 alloy tanks failed in service and none have failed catastophically since the eddy current/VIP requirement has been in place. But due to the unreasonable nature of some people who seem to like to ignore the obvious and confuse correlation with causation, I will amend the statement slightly:
"less than a dozen 6351 alloy tanks failed in service and no properly maintained, inspected, and handled 6351 tanks have failed catastophically since the eddy current/VIP requirement has been in place."
Truth is proper inspection procedures are catching any tanks with SLC's long before they become a threat. As long as a 6351 tank is properly inspected, maintained and handled, it presents no more of a threat than any other scuba cylinder.