There is a drawback the shady side does not do as well. Second the composting tube and vermiculite works ok if you know what percent of dry leaves, kitchen scrap, green compost to add, simply dumping stuff into chute will make a slimy mess, I learneed hard way. The other problem is decomopacting the soil and amending it each year, the vermivulture can not fully replace soil depletion. If in cold climate you can not leave perinials in it as it freezes solid.
There are ways to make one from a 50 gallon plastic drum with drain pipe a heat gun a drill and saw all. It takes 30 min per barrel total cost is about $50