I love these, my grail watch to. Very tempted to have a serious think about spending the $2600AUS + import costs to get a NOS one from watchco next tax year.
There is just something about the shape of the case that to me is just perfect. You can't describe it by talking about any one aspect of the case design because it is the way all the curves and proportions fit together that makes it perfect in my eyes.
I must be turning into a total watch geek because I have spent about 2 hours every night for the last 3 days looking at every tiny detail difference between the SM300 and my PRS-14. I have it bad and perhaps getting a NOS SM300 is the only way to go.