Still quite battery drainage on my 930 after .29. It's much better than before, though. It now seems to drain when in use, but can last a while when locked. Not sure if it is better because i went back to 8.1 for some days, and updated directly to .29 - without recovering data at any point. Only SMS and of course app data that comes automatically with re-download.
I also must say the Win10 preview does not in any way feel as polished as 8.1, but I've grown accustomed to many new features, and was having a hard time going back to 8.1. I honestly think that at the time of release, there should be NO events of glitching at all. All apps menu for examplpe, is not dimmed when you unlock the phone. Apps are still shown with cryptic app-codes in stead on name on some occations, There is a delay the first time you swipe left after unlocking, scrolling does not at all keep up with my finger. My entire argument pro Windows Phone, when I convinced my extended Family to come with me to MS-land, was that "it is just working - ALWAYS!" That was not the case on my Android phone. Nor is it the case on my Lumia 930 with Windows 10. Sadly.