I recently upgraded to Ubuntu 11.04 Natty Narwhal which now features the Unity desktop. The
11.10 version is already on its beta-testing phase. For now, my machine looks more like a Mac than a PC, but it's not quite the same as the other two.
What strikes me most is the sheer beauty of the desktop. There's a dock in the left side that disappears when the mouse isn't hovering over it. The notification icons in the upper right corner also look sleek. The windows open smoothly.
Unfortunately, 11.04 requires a much faster desktop. I noticed that my computer—which has fairly average specs—has significantly slowed down, especially with three or more memory-requiring programs running in the background. I also mourn the loss on the Gnome desktop, which I've grown rather fond of throughout all these years because of its accessibility and functionality. The Dash (analogous to Mac's Finder) doesn't quite cut it, but give it a couple more months, and it's going to be just as well. That's the joy of being in Linux: geeks all over the world are collaborating to make your life easier—for free.
This is the release that has made me do the most personal adjustments, and so far, I'm enjoying the novelty of the experience.