Yeah, trux has some very special fins on there!

The lunocet development is being followed with great interest in the freediving world, especially since the inventor has been posting progress and thoughts on deeperblue. The aqueon and freedom fins are the same theory done slightly differently, but not much use for hockey!

I've personally tried:
Speedo breaststroke fins (hilarious things. Good for training, crap for proper swims)
Effesub whalebone fins (makes no difference. Very comfortable footpocket though...)
C4 Mustangs (only out of the water. Very comfortable, I'm saving up!)
Split fins
And of course I regularly swim in a monofin. They get enough funny looks at the pool as-is.