The Auralex works really well. I bought them originally to angle my center down when I had it mounted high, but when I wall mounted the TV, I was able to bring it down and didn't need them for that anymore. So I already had them... Not fond of the way it looks, but I don't notice it either, and neither does anyone else.
The spikes would have been to isolate the speaker from transmitting as much vibration directly to the stand, but really not a great idea in most cases. My piano gloss won't like it for sure.