Rtings seems a similar project; some of their test results are free, some are paid. They have a wide set of comparison tools, they test for a lot of features and they document their testing procedures well; it's a really nice change from SEO spam articles.
I recommend their tests of headphones [1], I especially like how they measure breatability [2]. They also have a page about printers [3].
[1]: https://www.rtings.com/headphones
[2]: https://www.rtings.com/headphones/tests/design/breathability