I've been using the soft Atoms for putting and the regular for throwing. The atom is the most comfortable disc I've ever putted with and I love how well it grabs chains. I have a tendency to miss right, and I have never had a putter that will grab the right side of the chains and suck back into the basket like the atom will.
As for throwing them, it only takes me about 3 weeks to beat one into being really understable. I throw the atom a lot because while I like the flight of the proxy I really don't like the regular neutron plastic. Hopefully there will be a soft proxy soon.