I flew the Sydney to Singapore route a couple months after the first A380's entered SQ service. Nothing special except the business class seats were weird. The seat and back were about three feet wide with a long seat belt that didn't really hold one in place side-to-side, and the little compartment where one's feet go after reclining the seat was offset to one side. I was in a starboard side seat so it was offset to my right. Result: impossible to get comfortable and pain in my hip once I got up after an 8 hour flight.
And after the recent engine failures on a couple Qantas A380's I will try as much as possible to stay with B747's for any really long haul flights.
As with any new aircraft, there are going to be some bugs to work out.
I was surprised to hear about the weirdness of the seats. That’s surprising to hear. I’d hope they would be able to fix this with a relatively minor amount of effort.