After more than 34 years in the hobby and 30 years of keeping corals, I still like GSP.
On one tank I had, the back wall was almost completely cover with it and once it got to the waters surface, it built up layers and underneath the layers it had runners like that.
I grow it on 3” ceramic disks on the bottom of my bare bottom tank. As soon as it grows off the edge of the disk I cut it off and glue it to another disk. This way I get the cool look of gsp without any of the hassles