i have Genesiss / seac sub bifins 85 cm stiff blades
and this medium stiff mono by specialfins
i must tell u that i'm very happy with my bi-fins [i found them more effective than gara3000, but u must have strong legs]
in the future try 2 buy a monofin, because it's a different experience
at least in pool trainig [dinamic apneea] the mono will provide u more effectiveness than the normal bi-fins
