I received my HTC One 2 weeks ago. For the past week I was afraid to download the 4.3 update due to the reports in these forums of all the problems. Finally I bit the bullet yesterday and did the upgrade. I must say the upgrade went very smooth and I don't have any of the problems that are being reported here. I did not do a factory reset either. My battery life is just as good if not a bit better as before the upgrade. Wi-Fi works perfectly. The only problem that I do have is that no matter what music player I use my phone will play each song twice. Then it moves onto the next song and plays that twice, etc. I've used Beats as well as Power Amp paid version. But that is the only problem I have seen.