Got the ISO from my company's MSDN last night and did a fresh install on my 5-year old HP laptop that originally came with Vista (has been running Windows 7 since release with no issues). Used a W8Pro key. I can verify that W8 works just like W7 in that you only need the regular ISO, the features will be installed based on what key you enter.
The install wasn't particularly quick or eventful, comparable to W7 on this laptop (slower RPM hdd). W8 picked up most of my hardware, I was pleased that it got my wireless going from the get-go. It did not load my video card, which is a nVidia Go 7150M. I first went to nvidia.com and did the java test for it to just point me directly to the driver, but it said that I needed to download the driver from the manufacturer website. I went to the HP website and downloaded the most recent driver, which was for Vista 64-bit from 2007.
Installed that driver, rebooted and logged in. As soon as I moved my mouse, all the tiles on metro immediately disappeared. I was able to WIN+D to get to the desktop, but going back to metro showed all the tiles were still gone. Restarted and same thing, I can see the tiles after logging in but as soon as I move my mouse, they disappear. I finally went back to nvidia.com and downloaded the 7150M driver manually, installed it, and that fixed my issue. It would appear that metro is very finicky with video card drivers.
Other than that, it runs pretty good. Everything was kind of choppy for about 10 minutes after getting that last video driver installed, but it suddenly cleared up and everything was good to go. It almost felt like it was still configuring itself in the background but letting you go ahead and use the OS.
This laptop is mainly used by my wife, so it will be interesting to have her try it out for the first time tonight. So far, I think W8 is fine. I know a lot of people complain about it, but I'm giving it a fair shake. I think the transition between metro and desktop is OK. I'm not sure if Microsoft is planning on selling native desktop apps in their store (I think they are), it will be nice if they do this.