I had hit the lower button to open my favorite contacts. Had selected a person to message, selected their phone number, and dictated a message and selected sent text. The message went to the wrong recipient and phone number. Now I know it wasn't user error, as I had just tapped on the person's phone number and it is nothing like the phone number of the person who received the iMessage. That didn't make me feel all warm and fuzzy, having to worry if my messages end up going to the wrong recipient. Though it happened only that one time, and not subsequently. The other bug I noticed is sometimes an app simply won't open, the opening app animation just goes on and on forever. Not sure if this is a problem with the developer of the app, or the Watch os. But this is only Watch OS 1.0. I'm sure we'll be getting updates soon that make the watches work even better. I have to say, overall, I think this thing is pretty amazing. VERY happy with my purchase.