Nic10,
i am currently braking in my reference1. I have about 10 hours in so far. I am moving up from an original ref. sonata. I cant tell you about the difference between the master and ref1 but what I can say is that im glad i went all the way instead of going for the master. isay that because the differences between the Sonata and reference1 are improvements in detail, spatial stuff, and seperation that are not subtle and should probably get a notch better as it breaks in, but its not as much a difference as id hoped. If I would have went withe master i think any improvement in detail from sonata to the master with its lower grade stylus might have equated to a little better than lateral move. my opinion could change as to the overall feeling I have about the ref1 as it apparently according to grado needs 20 to 40 hours of breakin.