Well, I did exactly that as I did not want to start a new page and then having to update it, as soon as I finish. So far it Page builder is not doing too bad. I did run into a problem using the feature box, I do use the default Joomla template.
Unhandled Runtime Error
TypeError: Cannot set properties of undefined (setting 'external_plugins')
Please open the browser console for more information!
Call Stack
Object.extend
(4:11547)
DO
(4:378195)
(4:398569)
new OT
(4:398589)
Object.execCommand
(4:423694)
(2:545406)
tl
(2:557669)
wu
(2:577791)
(2:576533)
bu
(2:576598)
I will wait until the next update.