Well... I finally let myself try Windows 8... and I can say I don't like it at all... more click to do less, I really feel worried about this regression...
After taking several hours to test this on VMware, I find that this thing reminds me of Windows 3.11... in many aspects. First, you gotta rely more on task mannager, second, the tiles stuff in Metro UI, which I don't consider more than a layer over desktop that tries to replace a more usefull and faster Start Menu... In this, you can rearrange, add and pin programs and apps, but feels like a full screen mess rather than a clean desktop, at least in my case, I HATE having tons of icons taking worthy space and visual from my wallpaper... Intead Rocketdock + Start menu are my friends, even in my new display...
Also, here is some stuff that may be confusing for lost of users, specially having to switch to desktop to actually doing REAL stuff... metro apps like IE 10 look great, but are not that functional, and by the other hand, lots of software are still classic UI themed, that means no metro look, so you switch to desktop everytime you execute something and you need to do serius stuff, like configuring windows (services, startup items, control panel... etc...) I really find this a little annoying. Finally, some usefull functions in Aero are disabled by default, like Aero Snap and Aero Peek, you gotta enable this in order to use the desktop as you used to in Windows 7, and personally, I consider this a bad desition, since the enhaced Aero features were the strongest part of UI changes and improvements in Windows 7, which allows to work with tons of windows with no effort...
Metro UI (aka Bad Start Menu Replacement by myself) has no options to customize rather than just changing the BG design and combination of colors... what about a wallpaper? desktop is better and looks better with this that is already included since windows 95...
Some animations that made Windows 7 look really neat were removed, for example, when you move/copy/delete files, instead the dialog was redesigned with a graph and information over it... the old one looked better, but this is the less important compared to the oter stuff.
The pros? Yes, it has pros, the first one, seems that Aero works faster and cleaner, also seems to use less resources from GPU and looks more efficient. Overall performance is enhaced, Windows 8 (or at least Release Preview) is maybe, 5% or 10% faster than Windows 7, and I'm no talking about boot time only, but the overall system response and stability. Windows load faster, programs and also web surfing seems to feel faster and less sloppy (for example youtube and its loads of adds in flash... **sigh**) also includes flash player, so you don't need to worry about that pluing in particular.
In general, It uses at least 5% or more less memory than Windows 7, even havng Windows defender and Avast 7 at the same time RAM usage never surpasses 34-35% in a 1 GB system, CPU usage is reasonable even with one core...
Also, if you have programs that even ran on XP and work on 7, they will work on Windows 8, I tested Photoshop CS3, Office 2010, Avast 7, Corel Draw Graphics Suite x4 and ImgBurn and ALL of them work even WITHOUT compatibility mode, so you won't suffer from incompatibilities, this means that all hardware we go working on 7 will work on 8 too... Also I can say Task Mannager has better changes, since give more information on what you see.
With this, and adding that no start menu + edge hotspot relying (for start screen calling and options) looks like this OS is mutilated... seriously, is like seing someone after a carcrash that gone really bad... If MS needs to insist on touch screen support, they need to better separate UI interfaces, create a REAL Metro UI instead a layer over everything and leave normal desktop for PC users... But I feel this a bit silly, just because software deplovers like Adobe will have (maybe) a hard time doing both Metro and Normal versions of their software... Well... In this particular only time will say...
Sorry MS, Windows 7 is the best you could do by now, Windows 8 feels mutilated and like returning back to Windows 3.11...
My point of view though...