Are there any companion stats? Does it matter whether I give Cass a melee weapon or energy weapon or rifle, or is she equally competent with any of them? (Oh, and I already know companions svck, I tried searching on companion.)

They are specilist in certain skills Bonne for example is best with guns and ok with melee

I will add some more detail to this. If you bring up the NPC "wheel" and choose "talk" you can find one option to ask what they are good at. I have still not found any additional details about whether they have inherent SPECIAL values etc., or whether, for example, Cass is better with shotguns (her generic gun) than a lever action rifle, but at least it gives you an idea.

From the GECK:

Rose of Sharon Cassidy (aka Cass)
Melee Weapons
Guns
Sneak

Arcade Israel Gannon
Energy Weapons
Medicine
Melee Weapons

Craig Boone
Guns
Sneak
Melee Weapons

Lily
No class. Mutants have all skills assumed perhaps?

Raul Tejada
Guns
Repair
Science

Veronica
Science
Unarmed
Energy Weapons

Veronica appears to be stuck at lvl 12, the others level to 20 iirc.

Lily is good with Melee and Sneak

Well that explains why Boone is such a beast with his Machete. I told him to go melee so he wouldn't kill certain enemies I needed to loot and he went Rambo on everything. Talk about special forces... Dude is a death machine all around.

I've just tried to test the reported effect of Charisma on companion DT.
With the Living Anatomy perk VATS showed Veronica had a DT of 25 at Charisma of 1 or 10.
More worrying is that her DT didn't change when I unequiped her BoS Power Armor.

Is the perk broken or ?

Has anyone had a good look at (Perk)CompanionSuite?