After a few weeks of use, no major criticism. Fast delivery. No bill in the package since this charger, sent by Amazon, is actually sold by Vavorit GmbH (contrary to what the website). We get the day after the invoice by email, as a PDF file. So we find the rigor of the German company. (Some vendors sales network offered by Amazon should take a leaf). One minor criticism about the product: The charger accepts batteries of different diameters, and as the + charger is rounded instead of flat batteries start small diameter naturally skewed, so risk of bad contact: Try to make them stand straight before connecting the power cord. Regarding reliability, it will of course wait several months to be able to judge. For now, therefore, a great buy.