Those with experience playing with or against Spectre Cell. Do you find stun (assuming you get it off) effective towards beating SC? Or is it super easy, barely and inconvenience for them?

Stun will always be annoying, when you dont have an easy way to get rid of it, especially on melee models.

Stun on Ezra is a pain, if set after Ezra's activation it prevents start of round move and very likely use of Pummel during the round.