The battery drain issue seems to have eased after several reboots and unpairing/re-pairing with phone - I had to spend several hours on intermittent live online chat with Apple tech support (3 or 4 different people) to get that far, because I had to reboot my computer multiple times too (part of their instructions). However, now my watch no longer communicates with my MacBook Pro or iMac computers, which it used to automatically unlock for me. Then, the ECG App stopped working, which was the main reason I bought the watch. Neither problem is resolved. Since I live 70 miles from the nearest Apple store, and I don't have hours to waste on tech support, I'm left with a marginally useful $450 watch. Not very happy about this. Apple needs to figure out what's going on with OS7 and fix it.