Well, it's been 3 days since I've upgraded my 11z from Vista Home Premium to Win 7 Home Premium. In terms of overall ease and use, it went without any major hitches. The only things I note are:
1. The Windows Index went from 3.2 under Vista to 2.7 under Win 7. Mainly on the CPU rating (I have the Celeron version). I hope some optimization will come around.
2. Under Vista, I was able to hook up the 11z to my LCD TV using HDMI and got both video and audio to work. Now under 7, I only seem to get the video to work. I click on the sound devices but it only lists the laptop's speakers, no HDMI device. Sigh.
It's kind of odd, when I upgraded both my kids laptops (Toshiba and Acer), it improved the system overall.