This week there's a special event in Torghast where you can get a beast companion at the start of the instance and then improve it with anima powers instead of your own. This is the regular wings, not Twisting Corridors
I did a couple of Layer 8s, and as I was the healer, I gave the beasts a whirl. They seemed okay to me. I got this combo where the beast did 100% extra damage, but lost health every second, and a power where if the beast dropped to low health, it would explode. When the combo went off, it did a lot of damage.
However, I think it might have worked better solo. With a full group, we were killing things pretty quickly, so nothing lasted long enough. The beast did do the majority of my damage. And I mean I was a healer, so it's not like I would have done high damage if I hadn't taken the beast.
I've done both wings, so I probably won't do Torghast again this week. But the next time it comes around, I might try doing a wing solo with the beast companion.