I have a strange problem with the tag. Even for my very simple example, value bindings inside nested repeat components do not work as expected.
Interesting issue. I can reproduce this with Mojarra 2.0.3. It's definitely a problem in state saving of ui:repeat. I've reported it as issue 1807 to the Mojarra guys. It works by the way fine when the outer loop is a c:forEach.
ui:repeat
c:forEach