they'll only improve so yes, if you like them now, you'll like them more later. my very unscientific guesstimate would be that they'll improve by about 10% - not enough to radically change your opinion of them, but possibly enough if you're on the fence.
How to evaluate amps that are not broken in?
I'm expecting to demo Belles and JoLida amps next week at home, and both units are new. Can I assume that if I like the sound of an amp now, I will like it just as much after it's broken in? How does one account for this variable when trying to decide if a new piece of gear will be synergistic with one's system? Thanks!