For 3 points and a gear slot this upgrade adds the Expert Climber keyword to a unit, allowing them to clamber without the risk of taking damage.
At 3 points grappling hooks isn’t expensive, but the benefits are fairly limited. Climbing and Clambering are situationally strong tactical choices, but for how little you will use the upgrade (once per game if at all) it is often more efficient to save the points and either take the 2 actions to climb or take the risk on clambering
Grappling hooks doesn’t have a ton of use in competitive play. It may be useful on Scout Troopers or Rebel Commandos with a sniper rifle team who want to get to a high vantage point for LoS and cover negation.
Core Set x4