#No, keep the current design
Placing the main menu on the right is awkward
The icons are cryptic. In particular, it seems nobody can find the review icon; on Stack Overflow, where the new top bar has been tested, reviewing has declined a lot
There are probably a lot of things contributing to this in one way or another. But it's hard to ignore that, after the initial "novelty" spike, the activity in review has been declining pretty consistently ever since we changed the textual link to an icon.
Textual links (in the old design) are easier to see at a quick glance
The search box is unnecessarily huge now and changes size in a disturbing way
The numbers on the messages and achievements icons are smaller and therefore harder to read, particularly if you're trying to optimise resolution on a small laptop screen
Clicking the "Stack Exchange" logo does nothing
The colour-change of the achievements icon isn't discernable if you have deuteranopia (red-green colour-blindness)