Have my Galaxy Nexus. It is incredible. I don't think I've ever been quite so impressed with a new bit of technology.
The handset itself is very nice: very clean and sleek looking, and nice to hold. The build quality is pretty good: it's obviously largely plastic, but it's all fitted together nicely and compactly so it feels well balanced and solid. The screen is incredible: massive, bright, and very sharp. You can have the BBC news website loaded and zoomed out so the whole thing is displayed on screen and still be able to read the text. The hardware finally feels fast enough for the underlying OS -- things happen on the screen at the same time/speed as you're doing them -- the whole experience is very responsive.
The underlying OS is also excellent, and a significant evolution of the previous versions of Android I've used. Simplification seems to be a big feature: there are only two press-able things on the phone itself: the volume rocker, and the power button (replacing the six on my previous phone). Everything else is managed via software. Here, everything has been simplified as well: there are three main navigation buttons (back, home, and multitask) all of which do exactly what you'd expect, and are extremely responsive. New apps are designed specifically to fit with this new interface; old ones add a fourth button to the navigation bar which acts as the old 'menu' button. The general design is modern -- sharp, minimalist, bright colours. It looks lovely, but it's a shame the 3rd party app shortcuts (which are frequently low resolution, the wrong size, and ass-ugly) sometimes spoil this a bit.
The significant new parts of the OS seem to be face unlock (a bit shit: only recognises my face 1/10 so 9/10 you have to type a PIN in, so it's faster to just do this all the time), the battery monitor (a little useful, quite interesting if you're a graph-loving nerd like me), and a data use monitor with the ability to set warnings and limits (very useful, especially given that I've had to change to a 1GB package). The text-to-speech has also been updated so you can dictate in real time: this can be either startling accurate, or laughably appalling. It's probably faster just to type on the (very good) on-screen keyboard. The supposedly instant access to the Google updates has proved a little disappointing: my phone is still on 4.0.1 (latest being 4.0.3) and I only got the volume bug fix (which had not affected me) last night. Hoping that this gets sorted out as time goes on.
I'm extremely impressed.