It is so and so. I tested phone calls and sms, and they seemed to work, while lacking polish on UI side. I don't know any email clients, and didn't notice that there would be one pre-installed. Package manager (gui one) froze, so zypper should be used.
Edit: Virtual keyboard was pain in previous builds, as it always jumped in front of terminal screen, and there were also focus errors in terminal. Now this is fixed and terminal can be used as it should. Also virtual keyboard has started to resemble Harmattan one (as it should too )