Just completed 3 days of diving in Cozumel with my new Spectrum. It was the best diving experience I have ever had. I have always had problems with significant leaking...to the point where I had pretty much given up on diving. With the Spectrum I had zero leaking. Zero. I could get in any position without any concern for water sloshing around in my mask. No more constant clearing of the mask. It was awesome!
I had zero fogging. I took great care to apply 200ft VIZ defog hours before the dive (if not the night before). I let it dry and then buffed it out with a microfiber cloth. ZERO fogging.
I do have the ABS installed and I consider that a must have on the mask.
My air consumption was a little higher than in the past. Could have been the mask. Could be that it has been some years since I had been diving.
Some words of caution for those thinking about buying a Spectrum. Be aware that it does not work with all second stages. You cannot use a second stage that has a double lip barrel. So, take the mouthpiece off of your second stage to check before you buy the mask. If you have a US Diver Conshelf 21, don't bother checking. If has a double lip.
The mask will not work with all regulators. I replaced my Conshelf 2nd stage with a Trident LX second stage. The mask fit on the second stage, but the Conshelf 21 first stage couldn't deliver enough air to keep the mask from shuddering when I inhaled. The good folks at OTS explained that any full fask mask can shudder and they saw that most frequently with low-end regulators (like a 30 year old Conshelf 21).
So, my mask ended up being pretty expensive as I replaced my Conshelf 21 with a Aqua Lung Legend LX. But I couldn't be happier because it works like a dream and the investment has restored my enthusiasm for diving. When my wife saw the credit card statement, she told me I better do a lot of diving. So, it has worked out really well.
Despite the cautions mentioned above, please take this post as a huge endorsement for the mask.