Order events - what to use?

Hi,

I noticed a while back that when implementing IOrderRepositoryCallback it is marked as deprecated and refers to implementing IOrderEvents.

However when implementing IOrderEvents it is marked as an unstable pre-release api.

Which is the safest way to go for the moment, is it simply an old summary that is set on IOrderEvents or should one use IOrderRepositoryCallback until IOrderEvents are stable?

Thanks!