I tried on my 2013 N7 about 5X, and the OTA continually failed. I finally just downloaded the image, bit the bullet, and installed it manually. I must say, I like what I see so far. Mine was a clean install, and after the first couple of post boot screens, it asked me if I wanted to get all my google setting from another android device. I turned on NFC on my S5, touched the backs together, and voila, it knew who I was and started downloading all my apps from my google backup. (After I entered my password of course.)
Still loading, but so far, I like 5.0.1.