Modern implementations are decent but there's no open source implementation in that class. OpenJPEG is improving but it's much slower than Kakadu (which is what CoreImage uses) or Aware.
Heh, yes - I've been following that since you announced it. It'd be really nice if we could start getting the OSS toolchain onto a JP2 implementation with decent performance — I think jasper really soured the reputation for many people.
