Composting toilet reviews on Amazon.com tend to vary with the model, as of 2015. Some models receive high ratings, while others get low ratings depending on the reviewer' s past experiences with the models.
The reviews for the Nature's Head self-contained composting toilet on Amazon.com are good. The consumer satisfaction is above average according to the site. However, the consumer rating of the Sun-Mar Excel self-contained composite toilet is slightly below average.
Most reviewers on Amazon.com found the Nature's Head self-contained composting toilet to be perfectly designed to be non-odorous, but a few note that it is highly priced. Several reviewers found the Sun-Mar Excel self-contained composite toilet to be defective, poorly designed and highly energy consumptive. However, a few reviewers rated it highly, deeming it a reliable composting toilet.