I really like to try one while spearfishing. Its better for us to deploy it in mask so we can mount our snorkles easily to mask's strap. How do they work in a mask? I have some spare masks and keen to try it but i am not very talented at DIY. Hovewer if i succeed it will have great benefit while spearing, hands free equalization (nose clip on nose pocket, will look funny i know

) getting one of your hand free (other is holding the gun) so you can put it proper place to be more hydrodynamic and most impostantly no mask equalization any more.
I even can pay some heavier amount for original fluid goodles but they seems bit delicate for spearing stuff and no place to attach snorkel safely (straps seems thin

)