Here's my experience with these. I have to say I really, really wanted to love them. Normally, I wear contacts under a regular mask so I can see perfect walking to the dive site, through the surf, etc. So that was the first negative with this mask, I have only -1.50 so it's not quite enough to use the mask. To use them, I had to go buy some +1.50 contacts to purposely make my vision even worse, so there went 50 bucks. Btw, if anyone wants a month's supply of Acuevue Daily Moist, +1.50, 8.4 diameter let me know
Have an almost full box just sitting around now.
If I was doing mostly boat dives, no big deal but I absolutely hated walking down the steps to the beach, esp for night dives and not being able to see more than a couple feet ahead clearly. Plus the extra step of taking off my regular contacts, washing my hands, and than putting on the +1.50 contacts, just another 10-15 minutes in prep time.
Now when it came to the actual dive, I have to say they do work and once underwater, everything is crystal clear but unfortunately they leaked like a sieve. I tried all the tricks, using silicone on the purge valves, replacing the useless neoprene strap with the superior silicone one for a tighter fit, and completely getting rid of any facial hair. Only on one dive did it barely leak and that was AWESOME but for that one good dive, the other 10 dives were a pain in the a**, constantly have to clear it.
In the end, I sold it on Ebay to some guy in Portugal and got most of my money back. If they actually didn't leak and fog like crazy, I might have kept them but just too much trouble in the end. I really wish they would offer a model without the purge valves, I've never had any problems clearing a regular mask and it would eliminate two failure points.
From the website, I see they have a 3.5DD model coming that I could use without any contacts, I might be willing to give those a shot again but seems like they keep getting delayed, first they were coming in 2008, than 2009 and last I checked mid 2010. Apparently some type of lawsuit, patent issue, etc.......too bad, I can see the huge benefits and want to make it work, maybe in the long run they'll perfect the design but for now happy with my cheap $40 mask.
Hope that helps and doesn't sound negative, just my experience and if they work for you without leaking or fogging, you're very lucky and enjoy!
Robert