My H2O downloaded the update regularly through OTA, all on its own, but after it installed it wouldn't turn on again and kept getting stuck on the 'moving squares' screen
eventually, after 30 mins, I tried to reboot it and it gave me a critical error -- I had to factory reset it.
Won't be trying that very soon on the Glo HD I think. Oh, and I still have the old home screen.
On a positive note, I'm reloading my books through Calibre and the device's processing time seems to be way faster than it was before.