Salibandy,
Well, My package from Speedo came today. Two "Raven" masks along with some other gear for the pool. I looked liked these masks would be comparable to the Sphera, but they don't compare. I felt that the vision was better than the sphera, but the lens is hard plastic so the volume doesn't decrease at depth like the sphera. I filled a sphera with water and poured it into the raven to compare volume. The sphera has roughly half the volume. Another thing I noticed is the hydrodynamics on the raven are poor. There is a shelflike ridge on the top that really creates alot of drag. I would not recommend this mask for any serious freediving. At least my kids have a couple more masks to leave on the bottom of the pool.
