Well Stealth Suits are T4 so S8 would wound them on 2s and have 2 wounds each so multiple damage would be good.
But yes many will just decide to not overcharge. The Skitarii player in my group already realised that advancing and then shooting at my Stealth Suits or Ghostkeel with his Assault Plasma isn't a great option.
True, but if it was me, i wouldn't want a 33% chance of killing myself for a 50% chance of 1 shotting a stealth suit. Not a great investment unless i was desperate, or it was strategically critical.