TexasMike,
The way these lenses work is as you go deeper, red is filtered out of the color spectrum first and will appear brown and dull. (Think about what you saw at the Flower Gardens.) The rest of the colors of the spectrum will follow as you go deeper. These lenses put the color back into the rainbow spectrum so that you see the true colors of the reef and fish.
I use the Seavision Ultra (www.seavisionusa.com), myself, and love it (personal opinion, not an endorsement). And, there have been many followers in this technology since. I can honestly say that if you have the chance to try a Seavision mask on; do so. The silicone is a softer silicone than many other masks and the mask fits almost any face.
Also, if you are in the market for cameras, make sure that the camera you buy has this color correcting lens on it as your pictures will appear sharper and show the true underwater colors.
Although I am not familiar with this particular product, I visited Aquavision's website. The anti fogging chemical that they put on the lens is subject to many restrictions that will put the mask out of warranty. It does appear that one lens is more tinted than the other. I guess that's why you cannot go diving in caves, caverns, or night diving with this mask. Just a consideration.