I will test some of them on tuesday and will send FW a feedback after the game.
Edit: I'll add that in my humble opinion the Xyphon is 50-60 points too expansive.
Are they even taking feedback on non-playtest units? Hopefully you'll still get their attention.
I've tried destroyers (DA, 3 games), new point cost, cheaper JPs and 2A base are a nice thing to have... but assault squads assault better, shooty units shoot better. I just don't know how (what would be their preferred target anyway) to use them, except of ocasional phospex toss and multicharging 2 enemy units so my other chargers benefit from rad grenades. Feel to expensive even for that.
Until they get new toys their status is still: nope.
Will inform FW shortly in a more constructive manner
Are you disappointed with Destroyers specifically because Assault Squads can take Power Weapons, Combat Shields, and up to twenty models, none of which Destroyers can do? I think that status quo is apt to change, at least in a DA context. The DAs were the first legion to use Destroyers and should be the most experienced in their use, especially if we take into account their infamous Dreadwing which, as a Rite of War, should at the very least turn Destroyer Squads into troops. Would you be more interested in using DA Destroyers if they could get DA-exclusive swords? After all, a DA isn't much without his sword, and the more effective the better. Why not try Ashen Circle instead, who are Destroyers with Power Weapons?
As for Destroyer shootiness, I think that FW was relying on the Moritat to do most of a Destroyer Squad's shooting (they even share his whole dual pistols style), since purely based on the Bolt Pistols, even Legion Tactical Squads have more firepower before factoring in special weapons.
Send that feedback about Destroyers to FW if you can, because Destroyers have been sitting in this "Elite Unit without Elite or powerful unique abilities" gulf for a while.
I've yet to build the army, but I'm running them in either a Black Reaving or Fury of the Ancients alongside Reavers with volkite and chainaxes respectively, with a scattering of Contemptors and Deredeos...
How do you foresee Destroyers being useful in a Black Reaving or Fury of the Ancients RoW? I thought you'd be more interested in using Reavers since they have more equipment options than Destroyers do while becoming Troops in the Black Reaving. I'm not sure how useful Destroyers would be in a Fury of the Ancients list. What are you planning?