It's only been a few months but I bought a rather large colony that has since become a HUGE colony. There was some die off when I purchased it but new flesh has encrusted over where the die off was. I moved it to less light and was a bit worried but it still expands huge every day. My Cardinal loves it and sticks by it most of the day since the clowns have the rbta.
IMO it does well in my tank because of frequent feedings, target fed with cyclopeeze and other small foods once or twice a week but also I never rinse any of my frozen foods so a lot of the juices flow towards this side of the tank and the goni grabs that on its own.