I've always known I was color blind, and always wondered what my reef looked like to everyone else. I have extreme protanopia. Reds, greens, Brown all look basically the same to me. Blue and purple are muted, and light shades of most colors almost look grey.
When I first heard about these glasses, I doubted they really worked. Luckily my boss is also color blind, and his wife naught him a pair for Christmas. Last week I borrowed them so that I could see my tank correctly got the first time.
I was amazed at the different colors that I didn't know were in there. Zoas, mushrooms, hammers, oreos, favias...all different colors. I didn't know my hippo tang and royal gramma were different colors. And my jack o lantern that had always been my favorite coral is cooler than ever.
The only downsides are that I have to give the glasses back, and they don't fully correct my color deficiency (it is to severe).
All in all though, they are pretty cool.