it's worth getting any amp off the floor, if only to promote air circulation/cooling. i used a sound anchor in the past but have recently chosen a zoethecus amp stand in its stead. my amp is quite heavy and has hollow legs into which furnished spikes may be inserted. the zoethecus stand uses a shelf constructed as a multi-layer "sandwich." placing my amp on the zoethecus lowered the noise floor . the sound anchor did not do this, which i guess was due to the spike-to-metal contact between the amp and stand. the sound anchor did not, however, produce any perceived detriments in the output quality of the amp.