I just finished these Watchers in the Dark tokens for my Rampant Lions. I've found them super useful in game - and having little Yodas in your army never hurts. Plus, after reading the codex and Heresy novels, I have "fallen" in love the Dark Angels lore - it's now in my top 2 or 3 favorite Space Marine chapters behind Salamanders and Space Wolves.

The Rampant Lions are a Dark Angels successor chapter known for their uncanny resilience and desire to fight battles against foes with superior numbers. Other Space Marine chapters believe the Rampant Lions have a deathwish but also have a desire for a death in honorable combat.  These models make up half of the Bladeguard in my Deathwing list (nee Winters SEO's list) and they are super choppy.  I tend to use them as a sacrificial unit and send them forward to capture the center objective, forcing my opponent to deal with them or have a ton of master-crafted power swords chomping away in their backfield. It also keeps enemy firepower away from my "To the Last" units of terminators. Bladeguard are so resilient in Deathwing, I rarely have to spend any strategems on them and I can save them for my other units.