I received my Surface yesterday as I was about to leave the office, so I have obviously had a ton of experience with it (not!), so this will be my first look into the device. If you don't know Surface is Microsoft Windows 8 tablet, what I'm using is the current product which runs Windows RT (I'll get to that in a bit). It should be stated that I am an iPad user, though I also have a Blackberry Playbook, Kindle Fire, and Google Nexus in my collection of tablets. I grew up a Windows user (From 1982-2009 I was ONLY a Windows user), but have been using OSX for the past 3 years, mainly due to iOS development efforts.
Hardware
It's hard to find fault with the Surface hardware, it's almost a little too wide (if you're a woman who's having a hard time fitting an iPad in your purse, then you don't want to get a Surface). The Keyboard clips in very well, the device seems to be built needing this keyboard, so DON'T get one without it. There are several buttons and ports around the edges of the device (which is one of the differences between Microsoft & Apple) and unfortunately Microsoft didn't learn the lesson that Apple did of making the power adapter for the device be usable in any direction (The old iPad plugs are this way and it makes it hard to plug in the device), also the plug is a plug, it doesn't have a USB plug (though the device does seem to have a USB port). Without the plug I'd give the look and feel of the hard ware an A, with the plug I'd give it an A- to B+.
The keyboard is flat, but as I get use to it, it becomes easy to type on. Despite it being a keyboard it isn't tactile, so if you're a touch typist you almost need to trust yourself.
Setup
The setup went easy, finally gave me a reason to use my old Hotmail email address. I'd give it a B on setup, the iPad/Nexus/Fire are much easier to setup, but they are just tablets (this is a critical issue here, I'll get to it later). My biggest disappointment is that in my corporate setting we use WPA2-Enterprise for wifi, the Surface doesn't seem to support this right out of the box. At home I can connect with no issue, which is where I did the majority of my setup.
Navigation
The navigation takes a little bit to get use to, you can navigate by swipes or keyboard/mouse. You swipe one direction and you change apps (note that the desktop behaves like an app that can then run programs), you swipe another direction and you get configuration settings, a third direction closes apps (but not on the desktop, since the desktop is an app that runs programs). Getting use to this navigation is funky. The missing start menu didn't bother me (at least not yet).
Metro Interface
The Metro interface is marketing, it looks OK, but it doesn't really serve a great function. The combination of Metro with desktop is also confusing, I feel that the marketing department won the battle over this and the UX folks got left in the dust.
Internet Explorer
Internet Explorer suffers a sever case of schizophrenia and can get confusing. It's an app that is also a program, the settings (such as picking a homepage) functions against both browsers (app and program version), I'm guessing this is so you don't need to modify your security settings twice. The cookies are kept separate, so when I logged into my Google account on one browser, I still had to log into my Google account in the other.
Other than that, MSIE behaves like it would on your computer desktop (even though it's a tablet app).
Microsoft Office
Other than the hardware the other fantastic feature of the Surface is that it comes with Microsoft Office. This is fantastic for those of us who have complex documents that are mangled by the various iPad apps. In this area the Surface shines. It doesn't come with Outlook (at least my RT version didn't), and the email it does come with isn't great.
No Chrome
This can be taken two ways, first is that the RT doesn't run Google Chrome (too bad), but also Microsoft is trying to minimize what's called "Chrome", this is the stuff around the window that tends to get in the way, things like toolbars and sliders are mostly gone or only show up when it feels you need them. For example the ribbon for Word is mostly hidden, you can pin it open to show all the chrome, but then you have little room for editing.
More Schizophrenia
It's very clear that Windows 8 is a desktop OS that's been placed on a tablet, so while the Surface looks like a tablet, it's not, it's really a computer, but it doesn't work well as a computer, it works better as a tablet. I know what I said is confusing, but it's what best describes Surface, it's confusing. The fact that it's a desktop OS that's been placed on a tablet means that some items are too small to touch (which is why you need they keyboard/mouse cover), I've also found myself launching apps or following links because it's having some issues deciding what's a "touch" action and what's a "navigation" action.
I found similar issues in setting up the device. Initially I found myself in the good old Control Panel, then I went home and had to search for the Control Panel, it seems if you open settings from the Metro window, you'll get a different set of tools than if you open settings from the desktop. I guess if you remember "Metro==Easy" and "Desktop==Advanced" you'll be OK.
Another aspect of this, when I was trying to connect to my wifi, one suggestion I was given was to check my ethernet cable... The device doesn't have an ethernet port.
Apps
I was able to find two of my favorite apps (Kindle/Evernote), but I wasn't able to find Dropbox, this is critical to me. I'm not sure if Dropbox will find it's way to the device, mainly because MS wants you to use their SkyDrive (which is like Dropbox).
RT vs Pro
To be honest I'm not sure why MS built the RT version, not sure I need to say more about it than that. Wait for the pro version.
Compare to iPad
You can't really compare this to the iPad, it's a mini computer. I think once the pro version gets out, it's going to make one hell of a laptop replacement, it's very thin and light and will do the work that most professionals need to do. If you're crunching numbers or have big spreadsheets, I'd stick to a real computer. I wouldn't get the Surface if I was looking for simply a tablet, it's too complex and I wouldn't get it if I was looking for a computer, it's not complex enough. I would get it if I was doing basic word processing functions that I needed to take with me.