I have tried several times, and am having problems with HelixLauncher. I guess I messed up when I uninstalled it before the upgrade. I thought I would need helixlauncher2, but discovered afterwards that it was only for the N1.
I can download it, but it is not in my app drawer, and when I go to it in the market or if I go to manage applications, my only option is to uninstall. I can not open it.
From what I hear, if you left it on your phone you are okay. Am I the only one that has tried to install it after the update?