I really doubt this is going to be sustainable system with that huge buffer, but I suppose U gotta see before u believe it.
I think compared to the other stablecoins in the market, they have the best shot in terms of the team and dual token system. Ever since their ICO ended, they announced lots of stuff such as this:
https://blog.havven.io/the-full-launch-of-eusd-is-coming-next-week-43e3f9ddc79A proactive team says a lot IMO