Android Classic.

If you're looking for a pure Android experience, then you've probably already decided to opt for the Samsung Galaxy Nexus. It's a competitive device from a hardware point of view, with a distinct advantage of being Google's baby when it comes to software updates. Early adopters will have to accept that some apps won't work and there will be a delay whilst developers update their apps.
But as a consumer device there are compromises. The screen dimming seems wrong, although potentially can be corrected by a software update. But we're concerned that as the screen brightness drops, the screen looks poor. It's a shame considering the screen is otherwise so very capable.
We also know that the lack of microSD card will deter some. Being able to expand the memory, at will, is important for a lot of users and this is one point that you can't really step around.
The volume issue does exist, although we didn't experience that problem when actually using the phone in the real world, only when we tried to force the error, but it's something to be mindful of, as there have been reports of extreme volume problems.
The Samsung Galaxy Nexus offers an excellent Android experience that's hugely impressive, but we really believe it will be surpassed by others, like Samsung themselves, within the next few months.