There is a lack of scientific understanding or patents describing how salt water can be used to produce electric energy with the efficiency and energy density that the company claims, and no independent third party measurements confirming the claims are available. The claimed performance contradicts research that has been done on flow batteries. It has been said that "there is no solid proof just yet that the QUANT e actually works and performs as advertised".
The Quantino allegedly has been using 12 kWh pr 100 km in a mixed test.  This is much less than every other mainstream electric car, including smaller and lighter cars. NanoFlowcell does not comment on this.
The person claiming to have invented the fuel cell, Nunzio La Veccia, has been accused of fraud in connection with a revolutionary photovoltaic cell that was supposed to have an extremely much higher efficiency that competing cells. In a court case he explained that the prototypes had been destroyed from "security reasons" in 1999 or 2000. As of 2015, no competitor comes close to the claimed efficiency. Similar accusations were made in connection with a car that was supposed to run on photovoltaic cells with an efficiency that could not be explained by science. The car was never sold to customers.
Nunzio La Vecchia, who is also a musician and song writer, does not have any formal education in engineering or similar, and has bought a PhD title.