DO NOT BUY ComposTwin FROM AMAZON.COM!! For some reason they cannot process the fact that the item ships in THREE cases. I am rating the company Neutral because the issue was with Amazon and NOT MANTIS. In fact after 3 attempts (I still only have 2 boxes) and 4 months I am just cancelling my order with Amazon getting a refund and ordering directly from Mantis. Yes, I now have to pay shipping. It is worth the money just to not deal with Amazon and e-mailing back and forth with their customer service!
I purchased a mantis twin composter 5 years ago. The assembly instructions are good, and it was not difficult to put together with two people.
After three years of use a plastic turning cog failed and we ordered new ones. They came, but were not identical to the original and the stand had to be again disassembled and redone a second time, but was workable after a friend helped modify the space needed for the part.
The hinges on the doors are the weakest part (a tab that goes in a slot on the drum) and the hinges broke off after a few years use. Rather than pay for new doors, the same friend put a different type of hinge on. Otherwise the system has held up and it is out in the weather (some severe extremes) year round.
I have never gotten compost in a few weeks, but if you have back problems, or physical limitations and are determined to compost, in several months time the compost twin will give you compost with less physical effort than other systems.