I flashed Zeus build 5 last night. Also flashed the ICS Theme Revamped (On Dope). Pretty smooth transition. Did all my backups (Nandroid, Titanium for my apps). Still not ready to give up Go Launcher. It's the one that (in my opinion) offers the most customization, and I'm pretty comfortable with it. So I'm running that on top of Zeus.
A couple of things I have noticed:
1. The text message issue that folks have commented on. I'm using Go SMS, and if the message that I am sending is longer than 1 screen, I will get an error message indicating that the message was not sent. This is irritating, and did not happen on Infused 2.2.3. I read over at XDA that it may be a modem issue. But there wasn't any mention if that was confirmed, or what modem corrects the issue.
2. Lack of voice to text integration from the Android keyboard.
3. The ability to flash additional themes and add-ons is fantastic.
4. Looking at different "toggles" now. Folks are developing different looks for the various settings (data on/off, wifi on/off, etc...). Some are fantastic looking. Can't get that with stock.
Still to early to tell how the battery life is compared to Infused.
If anybody has a resolution to the text message issue, I would love to hear about it. Zeus forum at XDA is 515 pages.
**Edit**
Just read on XDA that there is indeed a fix, and it involves flashing the UCKI3 modem:
All Infuse modems individually packed into CWM flashable packages -- added LB1 - xda-developers
Now I just need to read up on how to flash a modem.