I have one, they look nice IF you have lots of room to isolate them on the sand bed so you can keep them in a little better control.
I'm thinking I want to GIVE the one I have to my son-in-law when he gets the RSM 650S that he wants. Problem is they will need to get their new home built before he gets his bigger tank. The GSP grows FAST, not sure I can keep it that long.
Just use caution as to where you put it.