The tumbling composter comes flat, in a hundred pieces. I assembled it fairly easily. The only challenging bit is screwing on the baffled panels that make up the drum-- they only fit one way. Trial & error you'll soon figure it out.
Even with only one chamber full, however, the tumbler is not light! It needs a good lift & heavy push to tumble it. But this is only a worry if you have an extremely delicate back or are a very small person.
I haven't yet produced any compost, but I love the size, design, and convenience of the design.