I was reading a bit about acoustic guitars that have solid tops over laminated sides and backs and I am wondering if they will "open up" their sound through time as all-solids will, though less, or if they simply won't improve at all as they age.

I read many opinions, people claiming that their laminated Yamahas and Epiphones did improve, though just a tad... Others say these guitars simply won't improve at all no matter how long they age.

Any experiences?