We love the tv trays.  The wood in our house is oak and they blend very well.  Look expensive but are very reasonable.  We replaced our "old" trays over 40 years old with the printed scenery that was beginning to peel off.  The bamboo will alleviate this.  We too were concerned there was no locking device when the tray is open to keep it from collapsing when moving it.  We just put some sticky backed Velcro on the tray and the moving bar and problem is solved.