Mine started working after the official ATT Black update after coming from the developer's preview. I still use Arnold Vink's Glance-like "Me" tile to keep the phone from sleeping/locking when plugged in. Double tap is great tho, especially if you use a case that covers the buttons. I also use Adjust Volume by Inception. Arnold is working on a WP8.1 version of TimeMe which he claims will not have to be side-loaded.