I've never been a big fan of Takamines; they mainly got their market share a decade or more ago on the strength of their on-board electronics, which the rest of the world has caught up to since then. Without knowing what model you have, or what condition it's in, it's hard to tell whether your dealer's opinion was on-target or not. But keep in mind that you can generally sell a used instrument on the open market for more than a dealer will give you -- especially if it's an instrument with broad name recognition (which Takamine has).

By the way, some Taks do have a solid top. Don't know if any have solid backs and sides, but it's possible. You can usually (but not always) tell a solid top from a laminate by looking at the grain at the edge of the soundhole; if it extends from top (face) to underside, it's a solid top. But one can be fooled by this also, so be careful.