I haven't read of another club implementing a scheme like we have here. I'm abroad, though, and only generally follow football news with respect to City, so there may be something I've missed about someone else doing something similar.
With this type of scheme, there's always a risk that, when it becomes clear that quite large payouts will be in the offing, dishonest claims might follow. The schemes I was involved in overseeing attracted quite large numbers of fraudulent applications.
However, I think the solicitor acting for the eight claimants in this action is this guy:
Dino Nocivelli | Partner in the Abuse Team | Bolt Burdon Kemp. He's experienced in the field and, as far as I know, he has a good reputation, so he wouldn't knowingly pursue a false claim and I suspect he's unlikely to have been tricked by a con-artist.
I'll therefore assume that the claimants are acting in good faith until it's proven otherwise. Even if they lost the case, that wouldn't be proof that they were lying.