Well, I gave Eddy Current's a go. And while I'm sure this is a freak occurence... this is word to the wise, give them (or any tyre for that matter) a very good test before going backcountry or relying on them. I very nearly had a very bad day. Long story as no one would believe me otherwise, here goes :
Installed them, seated them without insanely high pressures (in the ~40psi range), after quite a lot of huffing and puffing (-----'ds of things to fit on bontrager rims). Did a test ride round the block, left for a week at 28psi to make sure was seated nicely. Deflated, packed into bag for travel...
... At start of the TransNZ Enduro event, unpacked bike, pumped back up to around 28-30, rode around registration, rode to dinner up/down a gravel road (say 15mins) including some bouncing around on them, got back let down to 25psi and then put the bike inside the house we were staying.
3AM in the morning- BOOM ! massive bang - woke our house up. Everyone had thought a C02 cylinder exploded. Nope- Tyre had blown completely off the rim all by itself. Ie one side of the tyre was still seated, the other side was hanging outside the rim. Everyone was groggy and baffled. No heated floor, no weird house temperatures, no unusual weight on the tyre.
This of course was the morning of race start of something I'd been hanging out for 3 months for.
Googling suggested the tyre bead had actually failed - Dr Google and Captain Obvious said 'don't ride that thing at all'. but why it would do that at 3am vs when I'd been riding on it earlier. Who knows. I'm sure an expert will give advice but everyone I'd talked to was baffled. It should have failed while seating, or while I was riding it. I tried reinstalling and pumping up to see what would happen and the tyre was completely deformed on one side and got worse with more pressure confirming the suspicion something had gone wrong inside the tyre.
I then spent the next 90mins running around trying to buy a spare tyre off other people before managing to get on my shuttle at the right time! Including going to the dirtbag/racer crew who all shook their heads when I mentioned Schwalbe "what are you doing, Maxxis all the way". Yeah yeah....
Only thing I'm thankful for it didn't happen downhilling way out in the backcountry, would have had a very bad day indeed. On the upside the Maxxis Assegai I managed to find, held up without a pinch flat even with only an EXO casing on some pretty rocky/nasty terrain.
As I said I'm sure it's a freak occurance, but next time before a big event/ride, definitely going to make sure a tyre is put through it's paces for a good few hours before trusting it.