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Shark has plenty of experience remapping Skodas but does he have enough experience of the Ed30? - I'm not suggesting he doesn't but am asking because I don't know.
He's more all over the Audi and tyre smoke forums just as much. I think most of his work has been on Audis as well. to be fair they all share the same engines/ECUs so there's only minor changes.
I think the biggest thing with shark performance, and reading threads on briskoda will back this up, is the customer service is absolutely phenomenal. Something which is evidently lacking in others.
@HeavyD give REGI on here a message. hes had stage 2 shark on his ed30 for a fair while now so you'll be able to get info from him on it.
Theres quite a few cupras with stage 1/2/2+ on SCN, cant remember their names though. From my experience and others his figures are comparable to REVO, and much higher than bluefin.