my integrated is audibly hard sounding for the first 10-15 minutes, but speakers i've owned generally inching them around the room and playing with toe in is how I break them in. I've never heard a dramatic change in sound. The reason the speakers we hear at shops sound so good compared to when we get them home is the rooms they're in. If you like the sound at the shop pay the dealer to come over and set up your system for you, that is if you're in it for high fidelity.
I not a dealer, just a frustrated customer who's never been able to get demo results at home.