Haven't someone already been through this with you in another thread? Or are you having buyers remorse now that you've ordered the Audiolabs.
As the Rotel is new, there's a good chance that nobody has heard that combination yet (unless one of the forum's friendly dealers can advise otherwise...)
The "dealer" you mention doesnt sound particulary good to me. Paying the sort of money you are paying any decent dealer would have them ready to demo. If you were test driving a car you would expect to pay money to demo it.
Take the advise off everyone here and listen to a variety of combos with those great speakers and judge it for yourself. If your dealer isnt prepared to do that go somewhere else