Assembly instructions seemed like they were badly translated from another language, but were not difficult to understand. It took me less than 15 minutes to put the washer together. 
I've used this every night for the past 4 days and I'm highly impressed with it. 
You do need to follow the washing instructions, so make sure you save those for future reference. 
Warm water works better than cold and requires less hand cranking time. 
If using cold water, I suggest 4-5 minutes of turning instead of the 2 minutes stated on the instructions, cold water wash for 2 minutes just does not seem to get the clothes as clean. 
I purchased this because my washer broke down and at the moment do not have the money for a washer and the closest laundrymat is a 30 mile drive. The Wonderwash hands down beats scrubbing the clothes by hand in the bathtub.