I just love it. It does show fish poo on it, and looks dirty if its not kept up though. Here is an updates pic with the lights on.
Also, I love the very fine sand, I keep low to moderate flow in the tank. I do have to be careful to blow the sand off any of my corals though.
I haven't noticed anything with the water chemistry. All my corals seem to be just fine, but my Duncans closed up after rearranging everything. I think that's totally normal though. I put the sand I had in the fuge (it wasn't much, I've been slowly taking scoops out for about a month or so. might be why I haven't noticed a big change in chemistry)
I just did an order on ebay, too. I got 3 sweet euphyllia, and I can't wait to see them against the black sand. Should be Awesome! I managed to get a red torch with an orange stripe down the tentacles, I'll post apic once everything is in and acclimated!