My wife and I will never go back to a traditional snorkel...with one exception. I had been watching the Tribord EasyBreath for 3 years. When they finally got their quantities and distribution up, all kinds of options hit the market. I chose the Vaincre 180 because it was a pretty cheap entry point to see if I would like this style of snorkeling experience. I bought S/M for my wife and a L/XL for myself and they truly worked flawlessly! I turned several people onto them during our snorkel trip in the Caribbean as well. I keep a decent 5-day shadow for a beard and mustache and I had no issues with leaking at all. A buddy of mine with a full beard couldn't wear it which was pretty much expected. My wife always takes a bit of time to get acclimated in the water and this really helped her get comfortable more quickly since she could just breath normally and not worry about it like she did with a traditional snorkel. My one nuance which other folks have mentioned is that you truly can't dive very deep with these. There is a ton of air trapped in the mask compared to a normal goggle so it becomes very buoyant once you hit 10-15 ft. HELPFUL TIP: A guide on our skorkeling trip had a spray bottle that was half Dawn dish soap/half water, spray it in the mask, wipe it around, rinse it out, and these never fogged a bit on a nearly 2 hour snorkel. My spit never worked that well. Buy these, you won't regret it.

Bought a large size based on the sizing chart. I measure from my eyebrow to my chin 5&5/8." Tested in a pool and mask leaked water in and I was disappointed because it seemed much more comfortable than the small/med size. Used the small medium size, it felt tight around my nose but worked flawlessly. Also bought a new version with a round glass which also worked flawlessly but seemed even more uncomfortable around the nose with the small/medium size. Not sure why but the large size snorkel attachment was about an inch shorter than the small/med of this same brand. The round glass version definitely creates a fish eye distortion (pun intended) but give a better peripheral view, but I have not decided which one I prefer. I saw one brand that was identical that had three size options, if i bought another one I would probably get the medium. Diving under water was not a problem, sometimes a little water would get in, but for the most part the valve on the snorkel tube kept the water out, and you are able to come up and immediately take a breath, without having the clear the snorkel for water. That fact alone made this snorkel mask a must have. Just make sure you blow out a little before you try to take a breath to make sure the float valve releases, otherwise you will be sucking the mask to your face. All in all this thing is awesome.

So I took a gamble on this one.. I purchased a used condition snorkel face mask from Amazon and figured it was worth a shot. I'm very pleased with it- both my girlfriend and I tested it in the pool yesterday and I was pleasantly impressed. It works great as a simple floating snorkel system (for those who don't want to go underwater and get water in their ears, but it also works very well in 8ft underwater. I did not see more than a simple drip across the lens when I was swimming around at the bottom of the pool, and I had a very clear field of vision. This is SO much better than wearing goggles with a separate breathing apparatus. I don't know why anyone would ever buy one of those again.
Since we're going to Jamaica next spring I'm going to purchase another one of these to bring with us.
The top portion (breathing pipe) of the snorkel easily detaches so you can safely pack it away from travel (in your suitcase), which is a huge plus, too. Cannot beat the price, and the quality appears to be great.

Snorkeling masks can have two major issues: Fogging and water seeping through the edges. I have used numerous mask and snorkel sets that do a great job against it, but mouth comfort can be an issue from prolonged snorkeling, also.

I initially saw a demonstration from a video about makes like this, and I wanted to see how well it works. Assembly involves placing the breathing apparatus onto the mask. The mask has a mount for a Go Pro which I didn't test but it is in a proper spot for it which doesn't interfere with the vision or breathing components.

The mask fit me perfectly. I could feel how secure the seal around my face was. Breathing does take a bit of a learning curve for comfort since I feel like the flow of air could be improved. It feels like I'm getting 90% of what I usually do with conventional snorkels.

This imparts a very clear view. The edges have corners which do change the appearance when you look to the side. I wish it were more rounded than angled. I did various tests, such as prolonged snorkeling, front flips and back flips. No issues except with a back flip in water which caused a rush of water to fill in the mask.

The breathing apparatus has a one way valve which prevents back flow of water into the mask. Some water does reflex into the mask but it can be blown out the vents.

Fit is perfect and I didn't have issues with leakage in normal snorkeling positions. I didn't feel excessive pressure on my face or the mask edges. It's a wonderful design for comfort.

Overall, I'm pleased, but I do feel like the air coming in feels a little more restricted than I'm accustomed to with conventional snorkeling apparatuses.

Fit perfect and it was awesome to use