This feature is the only thing that's stopping me from adopting Orion as my default browser. It's absolutely essential.
As a freelancer I have multiple work accounts on same sites, and I need to be able to open them at the same time in different profiles. Also I have multiple computers and want to be able to open these profiles (with their own history, bookmarks, extensions etc) on multiple computers with it all being synced automatically. Chrome has this almost perfect, except the part where Google spys on everything to serve me more ads. I will pay to get away from Google for a worthy replacement; I hope its Orion.