When I picked up the box with one of the Polycrystal shelves in it, it broke through the bottom of the box, landing on my toe. Needless to say, my toe was no match for the shelf, and it broke. Good thing I had this nice stand to listen to music while I stayed home to heal.
I bought mine through Galen Carol Audio, and had only a few weeks wait. I still have the stand, but use it in a second system. It doesn't currrently match the decor in my livingroom. I also had two Polycrystal amps stands, but sold them as I no longer have mondo mono amps. They all worked well to enhance the performace of the system. As far as diminishing returns, I would say that, by the time you start investing big bucks in stands, you should already have your system pretty much where you want it. I find that stands make a difference, but not as much as some other things you can do. I have or have had Polycystral, Sound Organisation, Solid Steel, Grand Prix, Sound Anchor, Premier, Stand Design, and many others. I find that the differences between them are minimal. An exception would be the Machina Dynamica Nimbus. This makes a big difference under CD players and turntables. But it is a single platform stand.