There seem to be a number of issues with the SailsSocketAdapter. At first it was throwing an error that socket was not defined, after setting window.socket = io.socket it was unable to find my models until I pluralised them in Ember - which previously worked as singular with SailsRESTAdapter.
I'm using the following stack:
Sails: 0.10.0-rc5
Ember: 1.5.0
Ember Data: 1.0.0-beta.7+canary.b45e23ba
Handlebars: 1.3.0
jQuery: 2.1.0