I joined the forum just to chime in on these.
I did the exact same thing when Silo went out of business. Actually bought three of the HP 520's with the idea of using the third for a center when I built a front projection setup some day. Well, I built that, but my finished basement is not a tall pour, and an HP 520 won't fit below the screen
I use two of them upstairs for music with a pair of pro 3's serving as a center setup flanking my equipment above the TV.
Mine were demos, but JBL took great care of me and I have a spare grill and two spare glass tops for them
Love these. The imaging is great. The rubberized narrow front baffle serves them well.