I bought a pair of Seawing Novas in about 2009 or 10 and this summer on a trip to Mexico, just before the last dive of the trip, the guide brought to my attention that one of the hinges had cracked; it was just myself and the guide so there were no spare fins to use, the fin failed about a third of the way into the following dive. I finished the dive with no other problems. When I got back home the local Scubapro dealer took my old fins and handed me a new pair on the spot. I really like the novas they've done everything I needed them to do, but I think I'll try a pair of the Cressi ARAs. It never hurts to have spares.
I'm pretty sure that the hinge cracking was a problem with the first generation and now they've fixed it.
I have Seawing Novas (full foot version) and they've allowed me to kick against moderate currents and keep up with people who insist on moving too quickly, despite my legs being very underpowered compared to most. Still working on a good frog kick, but with flutter kicks you get a lot of thrust for minimal effort, which is great for a small, short person whose muscle power is less than many/most.