I'll answer all of your questions. :)
Q. Has anyone compared Stillpoints to Audio Points?
A. I don't know but perhaps there is one who has.
Q. Are Stillpoints better than Audio Points?
A. I don't know but they could be. When one considers what a set of Stillpoints cost vs. the price of Audio Points, one should expect Stillpoints to be multiple times better. That I doubt.
Q. Are all brass cones the same and do the same things?
A. Not all power cables, ic's, nor sc's are the same, nor are any other components considered the same. For each has it's own unique style of execution, sonic signature, and design. Therefore, it should be very safe to assume that that not all brass cones are the same.
That was easy.
As for a few of the other comments posted in this thread. Some to many are aware that there are 3 camps of vibration control methodologies,
1. de-coupling/dampening/isolation,
2. coupling/mechanical transfer, and
3. The ecumenicals who like to combine coupling and de-coupling products thinking they are getting the best of both worlds. aka mug-womps, those with their mugs on one side of the fence and their womps on the other side of the fence.
Regardless of which methodology one adhere's to (except for the mug-womps), one simply should not expect to realize either methodology's full sonic potential via some half-assed commitment. Just like any other aspect of audio, vibration control truly requires an all or nothing approach to realize the full benefits.
And for many, vibration control is still a final frontier in need of discovery.
I can't speak for the de-coupling products, but when it comes to the coupling methodology, one should not expect maximum performance gains until a mechanical break-in period has allowed everything to settle. Yes, it's true. In my case it took at least 7 whole days for everything to settle. After that, the results were nothing short of a serious component upgrade.
But that radical change did not occur until the final pieces were in place.
And every time a racking system is moved, break-in can still take several days.
In other words, one should not expect to hear night and day differences during A/B comparisons.
-IMO