I wonder whether the key to the difference is in the SW.
I notice that on the Plat web site there is both normal and SW versions of the Stella, Twin Power and Biomaster. Actually the Stella that I know and love (the SW) has some features, like the round carbon handles as well as the 6000 models, that aren"t available outside Japan and are in the $1,000 ballpark.
Admittedly, it seems confusing.
Regards,
Trevor