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I was reading my new codex and to my shock and disappointment the servo-arm/harness are now specialist weapons and no longer add additional attacks. Please tell me i read it wrong but I don't think I have. With this new info are they even worth taking anymore?

You didn't, and given the Servo-arm is built into the techmarine they are still worth taking. Assuming you plan to take Techmarines that is.

It's always just been 2 attacks from the Servo-Harness.

The Techmarine gets one with his power axe, then two with the Harness.

They've always been described as additional attacks, but not extra combat weapons. How has this changed? The Servo Arm doesn't get a bonus attack if you charge, or anything like that.

The servo-arm is now a Power Fist with AP1 in essence, meaning you can strike with all the Techmarine's attacks at S8 AP1, but you don't get any extra attack except if you give him a second specialist weapon

So the way the servo harness is written it actually doesn't say it gives you two attacks with a servo arm. it says it gives you an extra servo arm. Wouldn't that mean he has two servo arms, therefore has two specialist weapons and thus gets 2 attacks at I1 not 2?

So can choose to purchase a power weapon with the tech marine, giving up his servo arm and thus giving him two attacks since he comes with a bolt pistol. OR buy his a servo harness giving him two servo arms, and thus giving him two attacks at I1 2xS Ap1.

He lost attacks compared to the other techmarines for sure due to the servo harness change. Good thing he can take a bike and other odds and ends. He's not be totally useless.