Yes, I am using two ways to view and you can only be logged in to one at a time. I thought it would have been a case of you can't actually watch on two devices etc, but if you are logged into say two devices and watching one it will automatically log you out of the one you are not using, which is a bit annoying.
Overall, it seems to be looking alright, but my complaints/worries are that you won't be able to flick through games like you could with True, I don't see any offering of match highlights anywhere, yet, and I wonder how long it will take them to put up the full match replay option.