It sounded really good, and I was impressed.
Got it home, and carefully installed it last night. I listened to it for about 2.5 hours. It is really good, but I don't think (at this point), that it's that much better then my old cartridge (at least, not yet).
Then why did you buy it ? Hypnosis ?
Some of the reasons it did work in your room:
-The dealer system was completely different than yours ?
-You don't have an appropriate tonearm or phono stage ?
Personally i don't believe in warm up process, if your cartridge is brand new the things getting better in first 50 hrs, but not so much.
Maybe you just don't like the character of this cartridge in your system, especially if it does not sound better than your old cartridge.
If it's not better than save $2500+
Return it, explain your opinion to the dealer, ask for another cartridge (ask for something to match to your tonearm and your phono stage).
Or bring your old cartridge to the dealer and compare them.
Or just get full refund and forget about it.