Solo, it is a big part of your damage mitigation and should be used as part of your attack chain. In teams it needs to be used wisely eg. against walls or in confined spaces.
Mmmm, makes sense since soloing I shouldn't be anyway facing huge mobs where to take full benefit of DA and in teams, besides confined spaces, can be used as a panic button or to remove aggro from squishies.-
Thx 
I don't have it on my claws/DA scrapper. I much prefer to have stuff near me in OG and CoF.
Edit:
Just to clarify, I have my this character set up for soloing CoT and Carnie missions for the arcane salvage and for the occasional bit of zone PvP.
Octavian Vanguard
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I liken it to doing 10 swipes to 10 foes at once while possibly grouping foes into a nice tight bunch to Eviscerate 3 or 4 at once. On a /DA though I would have it if there was no other better choice....Id probably get it.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
I recommend grabbing it.
I took it on my claws/regen scrapper, i dont tend to use it much - but as was said earlier in this thread it can be handy for damage mitigation.
Say for example you're taking on a boss and your health is getting a little low, you can knock him away using shockwave buying you that extra second to pop a respite, hit your instant healing or get in that extra attack.
Not my favourite power but it has its time and its place
I think it would be a must for any Claws/ scrapper, just not sure for a claws/da because of:
Dark Regeneration
Oppressive Gloom
Cloak of Fear
Death Shroud
To benefit both yourself and your team of these powers, you need to be in the middle of the mob, hence why a KB cone may not be the best idea for a regular attack chain, more like a "Panic" button which is what I was wondering.
I will definitely give it a try and see how it goes, then decide.
Heya,
This is a question arisen after reading another thread but I didn't want to ask it there to avoid topic drifting.
I have a Claws/DA which is extremely fun scrapper, he's at the point where I have to start thinking carefully about the higher attacks, and I am not sure shockwave with its KB component is that advisable on a DA. Should it be taken to be normal part of the attack chain or should it be used as a "Panic" button to clear aggro? Should it be taken at all?
Any thoughts on this please?