1. Resemble an actual, reasonably sized watch.
2. Display notifications from my phone along with their actions (such as marking an email as "Done" in Inbox, or liking a Tweet).
3. Allow me to respond with my voice for notifications that support quick replies.
The Pebble Time Round was great at all three, and (as far as I know) was the only watch to have the features that I wanted in a form factor that resembled a reasonably-sized watch. The only other alternatives currently are Android Wear watches, all of which don't look like the kinds of watches I like to wear (they're thick, with large bezels and superfluous embellishments).
If I knew for sure that a Pebble Time Round would continue to be useable for the next six months, I'd buy one in a heartbeat, but the uncertainty makes me hesitant to spend the $100+ on one.