When I create a pivot table showing the number of visits for each type of browsers and regions, here is what I obtain:

As you can see, regions such as Northen America the number of visits corresponding to Mozilla Compatible Agent represents a significant percentage (18% in that case).
While doing some research on the net, I came across this article on SEOmoz which talks about a bug related to Mozilla Compatible Agent.
Can someone with experience in GA tell me:
Q1: Can I trust figures under the 5. Mozilla Compatible Agent column?
Q2: How can I break down those figures to have more specific information on the type of browsers?
Breakdown for Mozilla Compatible Agent
Here are the totals per agent:

And here are the totals per device:

As you can see nothing obvious there as with some OS (e.g. Android) you can actually use different browsers. I just find it annoying that we can't get the exact breakdown per user agent string when clicking on Mozilla Compatible Agent (all you get is a line showing 5.0).
I guess I can at least conclude Mozilla Compatible Agents are mobile devices.