I've been pleasantly surprised by the W510, I've had one for about two weeks and I love it!
It's really well made, very sturdy, and the screen really is gorgeous. It's also as light as an iPad so it's perfect for carrying with me.
Obviously, power-wise it doesn't hold a candle to an i3 or i5/i7 performance wise it's very snappy for most things. Obviously the metro environment runs very well but so does the desktop. Office 2013 loads quickly and works fine and I've run Photoshop, Dreamweaver, and InDesign CS6 from the Adobe suite with no problems.
Photoshop and Dreamweaver actually start up pretty quickly, which I found surprising. InDesign took a while to load but once it did I was able to make a bunch of flyers (and have Photoshop open at the same time for image editing) for print (so not small files) with no problems or delays. It was actually kind of a revelation.
The only thing missing is a Wacom stylus but hopefully Microsoft will be adopting the Adonit APIs soon so we can use their very cool capacitive styli.
Considering how loudly Acer have been complaining about Windows 8 they've put out some brilliant machines. The W5 is great, I'm very impressed by the W7 and the S7 ultrabook is gorgeous. They're also priced well too. The only problem is that it's so difficult to get hold of them in the UK and nigh impossible to actually get to see one in a store.