Got back in the hobby after many many years. Used the caribsea shapes for my new tank which is around a few months old. Fish only tank, but planning to have some simple corals when i have the time.
So far it is a positive experience, no major algae outbreaks, but i am using GFO ever since i added water in the tank. I simply rinse them in RO water to get rid of the dust and throw them in the tank. The purple colour will fade a bit after 2-3 months, which personally i am not too concern with. Box comes with arches and caves, and it makes the aquascape relatively easier.
Only negative point i can think of is the price. A bit expensive for a few piece of man made rock.