I just got a Lenovo ThinkPad X1 Carbon[0] ultrabook 2 days ago and installed Xubuntu 12.10. It really is stunning how the hardware
just works. I didn't have to fiddle with any of it - I had out of the box support for the video card, Wi-Fi, Bluetooth, etc. Even multitouch trackpad gestures work (although I personally prefer the trackpoint). The laptop itself is nothing short of amazing[1], especially once you wipe Windows from it. In fact, Lenovo TrackPoints have never worked the way I like in Windows (where you can use the middle mouse button for both middle-clicking and scrolling), but they do in Linux.
I thought I would dislike the new chiclet keyboard, which deviates from IBM/Lenovo's two-decade old keyboard design, but unbelievably, I actually like it. Having used chiclet keyboards on MacBooks, I never liked them, but Lenovo seems to have done it right.
Edit: there's one other issue, but this seems to be a (depressing) trend in the industry: decline in user serviceability of laptops. You can't replace the SSD (it's soldered onto the mobo), and replacing the RAM is not recommended. The price is quite high, especially if you upgrade the SSD (not recommended; just get a 2.5" USB 3.0-powered external HDD - I got a 1 TB one for $70 just a few days ago) or RAM (recommended; 8 GB is always good to have these days, and there's only one slot, so if you replace it later, you'll still have to buy 8 GB), so watch for sales/coupon codes (there was a good one for Black Friday) or use your college .edu address to get a student discount.
Edit 2: Lenovo also changed the power connector to a rectangular shaped one, because the X1 Carbon's profile is too thin to use the old, circular one. This means all your old ThinkPad power cables are now useless.
0: http://www.lenovo.com/products/us/laptop/thinkpad/x-series/x...
1: http://www.theverge.com/2012/8/13/3232132/lenovo-thinkpad-x1...