Well, I have them in my tank. Here are initial impressions and comments. Out of the tank they looked to be a slight purple color. Under my leds, they look more like a light blue, which I kind of like. The plates sit down into the bases fairly tightly which is good because you don't want your flow moving them around. Placing them on the glass is easy because of the nice large flat base, but if you run a lot of flow you really need sand or something on top of the base to keep it from being blown around as they are much lighter in water (of course). They look fairly natural to me and not "fake". Given some algae and coralline growth on them in time, I think they will blend nicely. The 3 plate piece is pretty large. It takes up about a 12 inch by 12 inch area, so I had to redo some real estate to work it into the tank. The single piece was much easier to find a home for it. I like having bases that are a few inches tall, as it gives an inch or two of gap between the sand and the plate. I like that visually and probably better for flow, but this may be more of a personal preference. I now just need to buy buy some more SPS frags to place in them!