AFAIK it is the best performant and most feature rich Mercurial plugin for Eclipse.
Change highlights from 1.5.0RC1:
- History View: easier navigation with "open" and "compare", faster graph view
- Merge View: 3-way merge to resolve conflicts, more convenient context menus
- Lots of bugs fixed
For the full announcement and the complete changelist, read the original blog post.
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