Seriously thinking about getting a Kin One for my wife for Christmas if the no data plan is true. Her new every 2 doesn't come up until next October (when we'll likely go smartphone if she's working again) but her Env3 is rather blase. She currently doen't have (nor need) a data plan but has wifi at home and work (and I can turn mine into a hotspot if we're on the road together.) For messaging they should be just as good as she has now (with a much more pleasing interface.) And $119 for the Kin One at FULL price seems an absolute steal.
Another bonus for us is that she already has a lot of her stuff setup in the Zune software as she uses one of our Zunes at the gym. If she digs this and get further entrenched in the Zune software she'll likely just roll straight into Windows Phone for her next upgrade.