This is my go-to symmetric snorkel. To be clear - and I think I’m clear in what I’ve written - I do not use this for fast swimming. I never time myself. It’s for drills. I don’t flip turn with it. It’s almost the only time I don’t flip turn. It’s one model of symmetric snorkels and mostly what I’ve advocated isn’t THIS device, but the use in general by triathletes of this kind of device.
Anybody who says he prefers a finis, fine. This is my snorkel but if a different one floats your boat also fine. If you don’t want to use any also fine. But if you can’t swim with banded ankles without fishtailing , and still discount snorkels, okay, but…