So..."Thunderstruck" was a TIE advanced Squad since way back when:

• Tempest Squadron Pilot - Cluster Missiles
• Tempest Squadron Pilot - Cluster Missiles
• Tempest Squadron Pilot - Cluster Missiles
• Tempest Squadron Pilot - Cluster Missiles

Which was...okay but not amazing (yes, 8 3-dice attacks, but since they were unmodified it wasn't actually that much of an improvement over TIE fighters). It's got progressively better as first the TIE advanced, then ordnance in general, got improved:

• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips
• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips
• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips
• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips

This gives you four ships which, whilst not TIE/x7 defender tough, are not fragile either - not needing modifiers with their primary weapon, they are free to evade every turn, which combined with 2 shields and agility 3 puts them not far behind the more expensive defender in durability.

More importantly, cluster missiles and accuracy corrector are a match made in heaven, and can cause carnage against low (or zero) agility targets.

However, the problem with this squad was always its vulnerability to high agility targets: there are targets which can take 2-hit attacks for days, especially since deploying the cluster missiles means target locking and hence not evading, and hence potentially getting a ship blown away with missiles still unfired.

The problem with evade, of course, is that it's somewhat passive - if your opponent doesn't shoot you it's a wasted action, and you have no way to compel them to fire at you. However, you do now have the means to use those "wasted" evades with a Swarm Leader.

• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips
• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector, Cluster Missiles, Guidance Chips
• Tempest Squadron Pilot - TIE/x1, Accuracy Corrector

AND

• Commander Alozen - TIE/x1, Swarm Leader, Advanced Targeting Computer

OR

• Zertik Strom - TIE/x1, Swarm Leader, Sensor Jammer

Alozen hits like a tonne of bricks at range 1 - 5 attack dice with focus plus a free critical or a reroll, whilst Strom is tougher to hurt, and takes away an opponent's range 1 bonus, allowing the rest of the squad to joust with much better armed opponents.

Not sure which would be better in practice.

Definitely like the idea as you've seen my list for Vader as a Swarm Leader for Tie X1s. My first thought is that I wish Advanced could take long-range scanners. It would make them a little more effective at getting the missiles off without the problem of low PS getting target locks.

Otherwise I think it's still solid because it takes some heat off the swarm leader. The opponent can't ignore the cluster missiles completely without being punished.

The only weakness then becomes the overall low ps that needs to deal with arc-dodgers. And now your swarm leader also has lower ps so there is less of a chance of repositioning to get out of focus fire. I'd be curious to see how it does.