Nice that they got it going ahead of the promised date (tomorrow). I've signed in and out a few times to go between my two accounts, and two of those times I got "profile system is unavailable -- please try again later" but shortly thereafter it let me sign in.

One nice thing it did was add a reservation to my profile by matching up my FF number. On the Midwest site if you booked elsewhere it didn't recognize a reservation was "you" unless you manually added it. This upcoming trip was never "added" to my Midwest profile but now shows on my Frontier profile.