If it says just says Koa, without saying "solid top" its almost certianly not solid. Most manufactures will brag about the fact that it is solid, rather than laminate. So just as a "steak taco" from taco bell is barely meat, let alone steak, a "koa" uke is often just barely that. Solid Koa will say solid. Also keep in mind, when trying to work on a budget, the back and sides being laminate is not the end of the world, they do FAR less vibrating than the top does (which is why it is called the soundboard). One of my favorite ukes, but not nearly my "best" is a lanikai 8 string with a solid spruce top, and pretty laminate ovangkol (cheaper rosewood) back and sides.I think what you can take away from all these opinion and the one thing that is pretty universal in all of them is, play what you like! I think it boils down to, if you find pleasure in telling people you own a koa uke (or a BMW) for that matter, go with that. But you might find another wood has everything you really wanted, and maybe for much less money (say a lovely honda civic) And to respond to people loving the looks, while figured koa is pretty, it hasn't got anything on the quilted and flamed maples in my opinion, which is all it is, and opinion, from sound to looks its all about what you want in the end. You may wish to pick a uke out you are very interested in, and ask for others opinions here on UU to make sure its a reputable instrument. Best of luck
Alex