I bought 3, just because I wanted one primary diode, one to turn into a LED, and one to replace the one that I put in several years down the road.
PS: You still have yet to ship the diodes right? I need to know when you ship them, because I need to watch out for mis-delivery, we have the cruddiest mailman in the world. Almost all my packages arrive at our neighbors, and they tend to be abusive of them! The already broke a $500 dollar scope before, thank GOD we had shipping insurance! :-[ :-/