In the world of stringed instruments, particularly guitars, if there is one topic that seems to create more disagreement than any other, it's the concept of solid wood tops 'opening up' with time. So in what may prove to cause exactly the same sort of debate, lets look at that concept with ukuleles.
First up, if you are playing a laminate or plastic uke, then this doesn't apply to you. Nothing wrong with those ukes, it's just that they will never open up with time by virtue of their very nature, as I will explain below. I'm certainly not excluding you for any other reason than that, and I too own laminate instruments. Just beware any salesperson claiming that they will open up and change with time. They won't.