Okay, I will jump in.. First off I will say that the definitions in specific work well on hardwood, possibly a little better response than directly on carpet, but probably cause the floor resonates a little better. However truth is being on hardwood with a rug out in front of them have been the best overall that I have experienced just kill the first point reflection with some type of rug.
I have used the factory supplied spikes.. #1 they are about at least an Inch too LOW for me.. Now I have used Sistrum Stands and Both types of Audiopoints, the 1.5" and 2" versions.
Stock spikes makes them sound far more Muddy, and almost Hollow compared to getting them up a little higher and or with better vibration control on heavier spikes, This is my opinion and might not be completley a rule of thumb in every single acoustic environment. But I lost a bit of impact and 3 Dimensionality with the stock spikes of both the version cut off tips and with the tips Zu can supply.
Solid Brass spikes were far Better feel in the room than the Steel Nubby spikes supplied. Why? Don't know, better energy transfer? Just better Height? Or just better Mass? Well the brass are probably 10 times the weight, they are over 1.5" higher using the 2" spikes as well.. You equate why or how, but yes the Spikes sound quite different no question on that.
The cabinets vibrated much more on the Sistrum stands, the stands worked best on hardwood, but were pretty bad on carpet...
The 2" heavy solid brass spikes sounded the best in all configurations more or less, and they seemed to really eliminate any excess cabinet vibrations as well as bring the tweeter up to 37" vs. 35.5". I hated spending the money on them but they were just better. Experiment its pretty easy, Oh and Flat on the floor with NO spikes I thought would definatley obtain the most increase in Fullness or something and make the room Shake more, well Nope.. On spikes were always better and cleaner Bass and Midrange output whether the stock or Heavy brass spikes were used. I have never tried them on blocks of solid wood so I have no comment.