I moved from a gen 3 v10 to the storm 610. Personally, prefer the NK over the Epic. The storm has slightly less primary stability, but over time I have adjusted to this. I suspect it has more secondary than the Epic. I am more comfortable in the rough stuff in the Storm. Flat water speed is similar. The rudders are excellent.
If you are a beginner it may be too much boat. If you are a learner in flat, warm water, why not!
I've paddled and owned a lot of boats and the Storm feels like it sits between a Swordfish and Fenn Elite S, probably closer to a Swordfish. It feels faster and slightly twitchier than a Swordie.
Nice boat. A keeper.
Current: NK Storm 61, Kayak Centre Zeplin.
Past: Epic gen3 V10, Fenn Elite carbon, Fenn Elite Vac glass, Fenn Elite SL, Gen 1 Stellar SEL ultra, Epic V10 gen 2, Carbonology Vault, Fenn Swordfish, Red7 pro 70, Think Legend, Red7 60, Fenn Xt.