I have used a few different composters over the years and this is undoubtedly the best one I have found.  Others were too small, hard to get material in, even harder to get out, and were difficult to spin.  The size of these barrels solves the load/unload problem with a nice large opening.  The quality of the supports make them easy to spin.  Overall I am very happy.  This is the best tumbler I have found on the market.
I would offer the following hints for assembly: 
1) I ended up with the barrels facing opposite directions; oops.  As I decided which one to switch I concluded I like to have the lids open away from the front where I am standing.  
2) Also, I wish I had added a bead of caulk to each section as I was assembling them to avoid the minor leaking that occurs when spinning.