If you're just snorkeling, I would think the masks might be fine; don't know, I haven't been snorkeling for a while, so I haven't used one.
For diving however, a full face mask is a different matter, and I'm not sure how divers with one-piece* masks equalize pressure in their ears. There must be a way, right?
*Asterisk above because I just went diving two weekends ago with someone using a full face diving mask and she was fine with it. However, her mask was built in two separate pieces, with a rubber nose pocket on a mask part to equalize her ear pressure. The mouthpiece didn't have the usual bite grip a normal mouthpiece would, so she could talk during the dive. And if the mouthpiece failed for some reason, she could detach it and use her pony bottle for air, and the rest of the mask had a seal around her face so it wouldn't flood. It was an interesting setup. Not sure I'd ever use it, but I can understand the advantage to it.