How to evaluate amps that are not broken in?

Dcstep, I've been told that Alan Yun, Silverline audio speaker designer, particularly recommended Belles ... at least until he began building his own amps! My dealer is just now starting to carry Belles (I will be his first Belles buyer) and was unable to get hold of a burned-in demo unit. I will keep what you suggest re: low bass in mind.

How can you keep a burn-in anything from customers like me.
Nice guy from Audio Connections N.J almost lost it when I ask him to sell his demo that was breaking in for few days ( my friend that was there with me bought one. This is just when Rega Apollo started to ship). After going back and forward for good ten minutes he gave up. He didn't have to but he did. Nice guy. Nice place. Good people. I got my new Rega playing that night.
So, as you can see, with bloody bastards like myself it's not easy.

I bought the Maggies for my 2nd system from him - he was most accomodating, I agree!