Chris,
I agree wholly with Ed (Cipherjuris)...Furthermore, you have a balancing act to do with feet...where do you place them, will it topple, etc...
When i put in my SRA amp stand, the bass tightened up very quickly and nicely...in my untreated room...
Another product that you may wish to consider is the Critical Mass Systems which I am considering next for my Pre and Source...
I have tried HRS Nimbus (not so good), Stillpoints (good), SOund MEchanics (okay), Cardas Blocks (okay)....
instead of looking at individual products, think of your needs...do you want to put your components separately or on a rack...this will help your decision making...
Hope this helps...