The most common complaint against the Sloan Flushmate is that it can cause toilets to explode. The units are pressurized, and minor faults can cause them to burst. Rupturing Flushmates have been reported by customers as causing damage to the toilet and even to people. Additionally many reviewers on Amazon.com as of January 2016 complain about not receiving every necessary part with their orders.
The Sloan Flushmate III was recalled in January 2014 as a result of the weld seam splitting, which led to bursting devices. At the time of the recall notice, an estimated 350,000 units had this issue.
This recall and the related class action lawsuit caused Sloan to send users a kit to prevent exploding units. Many reviewers have indicated that these kits greatly reduce the power and efficiency of the Flushmate.
Reviewers also state that the Flushmate is made of low-quality plastic and has an overall poor build-quality. This has led to reports of units leaking, falling apart and otherwise breaking.
Several reviewers complain that the Sloan Flushmate models have insufficient information on which toilets they fit. Customers therefore become frustrated when they mistakenly purchase devices that don't fit. Other users indicate that Sloan's customer service is unhelpful.