243a0200_ne_Arena_Strategy___Blue_is_Me__Advantages
[Name] Beetle [Disadvantages] Needs to be micro-ed well. Cannot attack air. Weak against Devil dogs. [Advantages] 
With armor upgrades, can be hard to stop. Can repeatedly burrow and attack. Does most damage to bio units out of any unit, good at killing marines.
Starcraft 2: Marine Arena Strategy | Blue is Me
Advantages