The vertical band sander works well for flatting lams or bamboo but pearly is right it really shines with lam bows of any type and especially cleaning up limb edges , vertical or flat it still depends on even presure on the peace being sanded gravity doesent keep it flat it's up to the operator to keep the peace parallel regardless of band position , I like the vertical sander as you can use the ends same as a spindle sander for shaping handles or over lays instead of going to the spindle sander or shaping front view profiles accurately , the vertical sander is just more versatile for me ,but I have spent a lot of time using it ,I had the wen flat one before switching !