For 6 points and a training slot this upgrade allows you to gain an aim token when you declare an attack against a wounded trooper unit target.
At 6 points Hunter is expensive for an upgrade but average for a training upgrade slot - however gaining a free aim token is quite valuable in terms of action economy and on the right unit can be quite consequential.
This upgrade is recommended on most units if you have the spare points, but can be invaluable on the right unit. Keep in mind that although you gain the token upon declaring the wounded unit as a target you don’t have to use the token against that unit - making Hunter more valuable on units with Arsenal or units that can split fire.
Boba Fett Expansion,