I've been a bit surprised not to see AT-STs feature in any lists that people seem to run. I've been running two of them and having a blast.

My last list was (from memory):

AT-ST

AT-ST

Probe Droid

Elite Officer

Officer x2

...plus plenty of Command Cards for Heavy Weapons and Vehicles. With extra movement from the Officers and an extra shot from the Elite Officer, this seems like a pretty scary list (people seem pretty scared by it). Last game I played with it, my opponent finished with only one surviving Trandoshan, and I'd only lost an Officer and one AT-ST.

So apart from the obvious (AT-STs are vulnerable to melee... so just move before opening fire) how come more people aren't running them? What's the weakness that I'm overlooking that must seem obvious to everyone else?

The issue I see is the missions. Most are built around smaller figures. I would test it in a few missions vs Gaurds/officer combo first to see if it works

They seem worse at objectives, awkward to move and by including them you're limited to 5 or maybe 6 activations.

But there's no doubting they're awesome and probably make a perfectly fine skirmish list - but it seems for now they won't be top tier

Ya my main worry is them getting trapped in small hallways where they can't even move to make a shot and also blocking my own troops line of sight. Might give them a shot though to see for myself.

I don't see why they would get trapped in hallways? There's no hallways one square wide AFAIK, and Massive models can move over difficult and impassable spaces (and other models, pushing them out of the way if necessary) without penalty.

Blocking other models' line of sight, fair enough, but that's somewhat mitigated by the fact that once you've taken AT-STs and (Elite?) Officers to move them around, there's not much left that needs line of sight... though you do rely on the AT-STs to do the killing.

It has a lot of damage potential, but you also have to be really careful with a squad like that.

While your attack rolls will be high, you're really limited on attacks.

I almost feel like the probe droid is pointless, and you'd be better off taking it out, along with a regular officer, to put in another Elite Officer. While it's one less activation, you get another attack with an AT-ST.

One thing to keep in mind is using your AT-ST's to push your own figures. You can use this to your advantage to push your Officer's into or out of LoS, because as the rules state, you move the figures into the CLOSEST legal space. With only Officers, though, you're going to pretty much always use your AT-ST to block the LoS to them.

I love AT-ST's, but my biggest fear with running a double AT-ST squad is "Awkward" combined with any negative status condition. If you play against a squad with a lot of Rebel Saboteurs or Royal Guards (Which you see all the time right now), you're done. They're going to keep your AT-ST's stunned while remaining adjacent to you. This is why I prefer Weiss, but even he can get shredded pretty fast by a group of Royal Guards.

AT-ST

AT-ST

Imp Officer

Imp Officer

Imp Officer

Probe Droid

Probe Droid

7 Activations, not sure its any good though.

Maybe

AT-ST

AT-ST

Elite Officer

Elite Officer

Officer

Include Sit Tight as one of the 15 command cards

I've played list similar to ones suggested here. But when 1/3rd of the missions are auto win for officer / royal guard builds it hard to bring them to a regional. I hope they change the mission set for tournaments before worlds. Was hoping they would have by July. 2 At-St are very fun. I like to throw a royal guard in the list just to give them +1 block. you average 5 damage blocks. Very hard for non elites to scratch them.

AT-ST

AT-ST

Officer

Officer

Royal Guard

Losing the Elite Officer extra attacks... might be a big deal, is it worth gaining +1 block? Any defense against Rebel Blast?

You could also use Weiss in a build like this:

Weiss

AT-ST

officer

officer

probe droid

probe droid

Weiss's "General Orders" can give you other AT-ST and other figures extra moves.

This build at-st x2 and elite officer x2, officer was played at Chicago it didn't do very well. I thought it showed up somewhere else. I have had more luck with the single at-st plus stuff since if it does get stunned it can get out the way still