From the ebay listing:
"Subjective impressions
Compared to
Superstar Ortus Blue, Galaxy sounds more transparent and detailed. It sounds much cleaner and you can hear deeper into the music with more information in complex passages. There is better musicality and enjoyment.
Compared to
Abysscurum Pro Ortus, Galaxy sounds cleaner and deeper with a bigger soundstage and a more mysterious sound with smooth darkness. It doesn't sound as forward and "in your face" as the Pro Ortus. Everything is further away, Galaxy sounds more laid-back and relaxing. They are equally good overall, Pro Ortus is best for recording studios while Galaxy is best for home listening.
Compared to
Orca Killer Whale, Galaxy sounds quicker and more lively with better musicality. It sounds more analog with more detail everywhere in the soundstage.
Compared to
Supernova VibraDome, Galaxy sounds better than 7 pieces, but not as good as 8 pieces of Supernova VibraDome.
*snip*
Installation
Simply place the rock anywhere on top of your audio system. Its entire weight must rest on top of the audio system, because the rock needs gravity to work.
Performance
To know how the performance compares against our other tweaks, see the ranking list below for our Crystal Formulas. The sound improves further if the tweak is bigger and contains Pro clay.
Our products are also ranked based on price, the more it costs the better it is.
Made in Sweden
$299"
The more it cost the better it is.

How can you afford not to buy them?