Sipkes or isolation devices better under speakers?

At the risk of stating (and possibly overstating) the obvious, it likely depends entirely on what you're spiking them to. Spike a speaker into a concrete floor and you are really grounding the thing into something solid -- which can only help stability and reduce unwanted resonances. Spike a speaker into a suspended wood floor and you are potentially only coupling the drivers to another resonating surface and turning your whole floor into a problem. Spikes might work better in one situation and isolation in the other with the same pair of speakers. Personally, I've got mine on spikes (because the sloppy wooden floor is a bit uneven and the tripod spike arrangement is the only way to get the speakers stabilized) but have a makeshift isolation deal under the spikes in order to decouple them from the same sloppy floor a bit. I'm thinking about trying a hunk of granite under the spikes as well. It's a work in progress. I'd guess there's no single answer and suggest a bit of experimentation. Mileage will almost certainly vary.

i vote for the sipkes. -cfb

Aurios Pros are Vistek's biggest and most expensive audio product, about $200 apiece. They are essentially a 3 inch diameter flat bottom plate and curving top plate which move independently of each other, almost certainly with ball bearings between them. The top plate has an indentation for the spike to fit into, just the way spike cups which are fixed do. Four of them will support up to 2000 pounds. The speaker seems to rest securely in place, but when you push slightly in one direction or another, the speaker or other component will sway that way and then return. There have been favorable reviews in Stereo Times this past spring and fall. I know Audionut.com will tell you all about them, and I presume they have a bunch of other dealers also.

What are Aurios Pro please? At their website I am only only able to find Aurio MIBs and I cannot see how you would be able to float spikes with these.
Could you please explain in detail?

Please see my comments under the thread "Under speaker metal spikes...what is the point?" from last week. I set up my speakers (Eggleston Andras) as the manufacturer suggests--without screwing in the spikes until I was satisfied with the placement. (This is on a carpet.) I then screwed in the spikes and there was an immediate, readily noticeable improvement in clarity and detail. (This was with a cup under the spikes to keep them from digging through the carpet, and for stability.) Later, I put Aurios Pros under the spikes, floating the speakers. There was an even greater improvement in clarity and focus with the Pros in place than had occurred when I added the spikes. You can't use the Auris Pros under floor model speakers without spikes, and the improvement in using both is greater than almost any change since I got the speakers (other than getting new amps powerful enough to drive them, which my previous amps were not).