I don't know about the koa bass, or have any experience with aeros, so I don't have any input on that bass. BUT, the flame maple bass has the same tone woods and pick ups as my walnut top six string Fodera (mahogany, indian rosewood, duncan duals) and it has a killer slap tone. I'm not personally much of a slap player, but the tone on my fodera makes me really want to work on my slap technique.