if you want directly google updates in the future than there is little more to it.
1. the phone needs to be S-off. This only is possible if your phone runs android 4.1.2
2. you need to change the CID nimer of the phone to GOOGL001, so it will be recognized a google phone
3. you need to flash the google RUU
4. to get OTA updates you need to flash the Stock Recovery of GE
Sure if you google you will find many how to's.
I am not sure if i allowed to post a link to a side that is giving a good how to (it would be in reman anyway) but this works great i did it this way.
[Anleitung] HTC One zur Google Edition verwandeln (mit OTA) - Android-Hilfe.de
I am also comig from an iphone5 had the sence version of the one. But now with the stock google 4.3 i love this phone!!