What is the Silliest Accessory You Have Ever Seen.

"Btw, whatever happened to Geof Kait?"

Don't ask...he might come back!  

I haven't tried these so can't comment. But you can DIY with PVC pipes filled with sand on a wood stand. Cheap.

I think a big factor is the directivity of your speakers in mid and high frequencies and how close they are to your side walls. Place near the first reflection point, angled so the three elements present a reflective diffusion the those frequencies...is not so ridiculous.

FWIW, I've seen similar devices prescribed by Rives when they were in biz, and they weren't about selling these but about professionally creating a good listening environment. 

"He has never ridiculed or insulted anyone, but has always shown kindness and understanding."

Never say never.

"Btw, whatever happened to Geof Kait?"

Little clock continues ticking.