I have to say, this kind of quest is actually far above anything I'd ever expect to see in Graal. The people involved in this work did an outstanding job, and I've not experienced any bugs.
It's kind of cool because despite what year you began playing, everyone gets a chance to participate in Graal's history in some way, and prevent a catastrophe. The quest idea itself is awesome, and this is exactly the kind of stuff both new and old players enjoy doing.
It was a blast going back in time to see the old towers and see a decade's worth of history in the game.
Not only that, but there's a LOT to do in this quest. There are the 5 Anomalies to obtain for nostalgic and sentimental merit, and shops and stores within the other eras have lots of hats or furniture items. Not to mention the glitch chests, which take an effort to open by having to find the keys.
I have to be honest, if I hadn't had directions to follow, this quest probably would have taken me a long time to complete. I'd imagine this event and quest sticking around for a while, at least a month.
This was really fun. I still have many of the glitch chests to open, but for an older player like me, the Anomalies were more important.