I'd like to trade in my ONE for a DEAUX - just for the rolled lip ring. Mine has cut me a couple of times...
-Stubbie
They are just adding a silicon ring, which you can order for your ONE.
Not really, lots more:
http://coava.myshopify.com/blogs/kone1. New hole pattern. Gen 1 was only tested on a Mazzer Robur. Whoops. Gen 2 tested on a ton of grinders, including home grinders.
2. Different stainless steel. Thinner, yet less apt to dent. My Gen 1 is fine. My daughter's, who is apt to whack it, reflects her proclivity to banging.
3. FDA grade silicone ring, as you mentioned. Fits Gen 1.
Cost. Lots of feedback about it being too pricey.
Even more feedback such as, "Alleluia, it's made in the USA, not China." Alleluia wins. Good on Coava. Steel from Ohio, etched and welded in Connecticut, silicone from Seattle.
B|Java