Used a Xizor swarm in a store championship yesterday with good results. There were three of us running pretty similar lists. I had:
Xizor
VI
Virago
FCS
Autothrusters
Inertial Dampeners
5 pirates
The other guys had slightly different setups on Xizor.
I went 5-0 through qualifying. Played against lists with lots of AGI-3, so getting damage in with the pirates was difficult and I really relied on Xizor. His ability and auto thrusters were key to keeping him alive. He finished most games with 1hp left. Squads I faced:
4 Greens with PTL, Outmaneuver, Autothrusters - killed 2 As and lost 2 Zs. Had a HELL of a time hitting the As.
4AP, Scimitar with prox, Defender with ion - The ion was almost the death of Xizor, but autothrusters saved him. The prox mine hit with 1hit1crit and brought him to 1hp. I killed 3AP IIRC and lost 2 Zs.
7 TIE swarm - Killed Howl and a Black. Lost 2 1 or 2 Zs I think.
Keyan HLC, Biggs, Kyle w Jan - My only 100 point victory. Made a parking lot with the pirates, mowed down Biggs, then cleaned up. Lost 1 Z.
Soontir and Whisper 80 point build - Boxed Whisper in and killed her within 5 minutes, then chased Soontir with my entire squad for an hour. Ended up losing a couple Zs.
I think the Zs would do very well against lower AGI targets, but even against AGI 3 squads, there were enough shots to eventually land some damage. Inertial dampeners and the Segnor's loop were used infrequently, but they were game changing when they were needed. Xizor's ability and autothrusters were absolutely crucial. I rolled 1 evade with Xizor in the first two games. He would have been dead if I wasn't passing off damage to all the pirates.
I'll be trying this squad some more with different variations of gear on Xizor as well as subbing in Guri. Xizor's ability was amazing, though. Great insurance against bad dice. I think the StarViper is probably the coolest looking ship released yet and very fun to fly.