Firstly 7 points purchases you a 4 Attack secondary weapon at range 2-3 meaning the defender won't receive an extra green die for being at range 3. One downside however is that on the first roll of attacks any critical rolls are switched to stock standard damage rolls however if a target lock (or Predator/Calculation) is in play and allows a re-roll, the second rolls are not affected by this ruling meaning critical hits are in fact possible with this weapon. Lastly with the critical hit point, the HLC doesn't discriminate, regular damage or critical damage kills a dead ship with equal coldness.
Being a TIE Defender player the HLC is my 'go to' weapon, mounting them on these ships and attempting to go to town on some unsuspecting opponent which often never goes to plan but not through lack of trying. Both the names pilots are almost geared towards carrying the HLC I tend to think.
The majority of ships in X-wing usually throw 2-3 green dice at attacks so having that 4th dice to throw at a defender is a great way of ensuring some damage goes unanswered by opposing dice. Keeping at range 3 for as long as possible ensures you're inflicting the maximum amount of damage whilst keeping yourself topped up with the most amount of green dice as possible.
So is it worth the 7 points? Recently a comment on reddit caught my attention and stuck with me. Shout out to 'ChiBlock' for his infinite wisdom:
"Various ordnance allows you to roll 4 dice at that range. Still, HLC outclasses ordnance in that it has no firing requirement or cost, meaning locks and focuses can be saved to improve the dice results. If you fire twice with your HLC, you've already been more point-efficient than proton torpedoes."
It's widely agreed that ordnance for the most part isn't worth the points cost in the game currently so whilst it's a good comparison and/or argument currently, when the next wave is released with the TIE Punisher and K-wing it will be interesting to see if this statement continues to be validated.