The da vulcha squad is an interesting formation . The 3 units don't have to be attached together, but let's be honest, unless they are going
MSU they should be in large squad.
MSU benefits: with the deepstrike only
d6 they are quite acurate, great for some 2nd turn objective scoring, and late game linebreaker. They also can tie up enemy units turn 3 for use full harassment (probably don't get them any nobz or upgrades if you want to go
msu, the ghaz mobrule is horible, don't bother with a
bp, and just let them run, they were cheap and probably did what they were supposed to do.
Used
msu vulcha squad once against my brother's tau. I had a lot of other threats on the board and so the we're barely shot at, and the rest of the game they tide up his units in combat. I tied the game and they were instrumental to that.
For a large combined squad: the
d6 deepstrike (they have to deepstrike) helps in keeping a large squad from misshap, and thus more useful then a normal squad of 30 deepstriking stormboyz. The megasquad is also a great way to bring 3 nobz with
pk in a single boy squad, Haveing better
dmg output for little tax on normal boyz. If you have at least 30 in the formation you can handle the perils of the ghaz mobrule better. If doing a large squad I suggest doing either 30 to more to make it useful (though the max of 90 is very klunky with deepstrike, easier to misshap). If zag is your warlord you can reroll moral within six of him, but if you want speed then do a normal warboss as warlord for waaaghing stromboyz.
I'll be trying my next few games with a 30 man strong vulcha squad combined formation with 3 nobz with
pks. I know at a higher number they will be more vulnerable, but I have plans to have a bike mek with
kff running to cover them with an invul, and if I think they are threatened even more I'll have a painboy on bike run up and join the squad, this would provide 2 separate 5up saves that can keep them from getting blasted away. I'm looking forward to using the formation like this...though I'm not expecting too much, it could very well blow up in my face..at least I didn't pay much for my stromboyz (I scratch built them from normal boyz, this thread shows them off
http://www.dakkadakka.com/dakkaforum/posts/list/685059.page#8550937)