If you're considering Ultra 5's, I would also look at the Pro Audio Bono ceramic isolation devices which are very good value. They are comparable to the Ultra SS & some feel they sound more natural. Though as good as they are, nothing touches the Stillpoints Ultra 6's with Ultra bases under components. "Best" is a much over-used term, but in this case I think it applies.
Stillpoint Ultra 5 v Nordost Sort Fut for Speakers
Has anyone done a direct comparison of the Stillpoint Ultra 5s with the Nordost Sort Fut under speakers? I am looking for these to replace the spikes under my Wilson Maxx IIs. I currently have my speakers on a wood floor suspended over concrete. Thanks.