I found The Wirecutter quite useful. It's been purchased by the NYT, I hope they keep it going in the original form. https://www.nytimes.com/wirecutter/ https:

I found The Wirecutter quite useful. It's been purchased by the NYT, I hope they keep it going in the original form. https://www.nytimes.com/wirecutter/ https://www.nytimes.com/wirecutter/ In Germany, there is the Stiftung Warentest, which has in depth tests of many household appliances and goods. According to Wikipedia, they cooperate with Which? in the UK and Consumers Union in the US. https://www.test.de https://www.test.de https://en.wikipedia.org/wiki/Stiftung_Warentest https://en.wikipedia.org/wiki/Stiftung_Warentest (For example, when they recently tested shaving blades, they had 23 testers shave their face half with one, half with a different shaver, randomised, then had each (half of each) shave assessed by the tester himself and an external expert blind (ie the tester did not know which shaver was used, or how the tester had judged the shave). Assessed where: quality of the shave; comfort; burning, reddening and irritations of the skin; cuts; how many shaves until the blades were blunt; ease of use & switching blades; cleaning of the blades; presence of polycyclic aromatic hydrocarbon and other chemicals in the handle; and more.)