I am very impressed by the quality of this design and the thought that has obviously gone into it.   It fits together quite easily, the documentation is clear and very importantly, all the parts are well labelled and packaged.  I managed to assemble it solo with the help of my workmate, some clamps and bits of wood.  The use of a soft headed mallet is definitely required.
The force to turn the drum, after loading and wetting, is low.
My only gripe is that the delivered box had been packaged to looked like a dog's dinner, but nothing had been damaged or lost.