Any experience with Harmonix feet

Well, in my particular case the RF999-MT actually cured the detrimental effect of new carpet. Again guys, Harmonix are tuning devices that have to be auditioned, always (which is also the reason why general statements such as "X is better than Y" are meaningless).

Clabe and Karelfd, My choices are as follows: 1. Spike the speakers through the carpet onto concrete. 2 Spike the speakers onto the Harmonix feet on top of carpet on concrete. 3. Cut small circles in the carpet and put the Harmonix directly on the concrete with the speakers spiked on top of them. Which do you feel would sound the best?

Hi Husk01!
Karelfd is wright there is no general rule, to be certain you have to test different options. I believe these expensive feets will do fantastic job if set-up correctly.

Hi Husk01
I would advise against option 3 which looks like an irreversible action for an uncertain outcome. Option 2 at least looks promising, my own Tidal speakers weigh about 200 lbs each, the spikes that go into Harmonix feet are plain rigid ones, the carpet is very dense and short-haired. In my room this worked perfectly well. Option 1 is your point of reference, I'd say (I guess you are talking about the original spikes that you already have available, right?).
Good luck!
Karel

Thanks guys, I am going to try option 2 first.