I was excited to find out that installer.app can now work with the 1.1.1 firmware. I installed it and add all the apps that I had before the update.
Unfortunately I uninstalled it after a day.
There was definitely a performance and stability difference with my phone right out of the gate. I had several lockups and had to hard reboot my phone a couple of times. Added to that the phone just seemed to run slower.
My advise is to wait until February until approved apps are released.