I have used composting frames, and static piles that have to be mixed and turned.  THe YIMBY Tumbler Composter arrived in a small box, and took only a little effort to assemble.  I made one error in assembly of the frame, bur was easy enough to rectify.  I had compost ingredients already stock piled, and dropped them in once the assembly was complete.  The 2 section compartment is a great idea.  One side filled, the other is available to accept material.  I turn the body of the unit every 3 or 4 days. I can see progress even in the first few days.  

Easy assembly, simple operation.
None.