I will say that I've run almost every variety of Ego battery at 1ohm(sometimes slightly lower), but after looking up what batteries are actually inside the Ego batteries and finding that they were incapable of providing the amperage required for 1ohm and lower coils, I stopped doing it. No need to have an accident and feed the media. There MIGHT not be any problems, but that's not something you want to bank on when your face is involved.
I suggest save up a little, and then look for something that would give you a lot more overhead. For a minimal expenditure you can find something that can operate way lower than you think you plan to go right now, with way more power than you think you need/want. A Kanger Subox kit is a fine example, and would allow you to switch tanks at will. If you absolutely don't want to go box mod style, then wait until you can buy the Ego One kit in it's entirety.