This question was brought on by one of danluu's posts, which linked to another post going into why benchmarking matters. In that post, I discovered a bunch of different places/people running benchmarks to determine the highest performing "thing". Over my years on the internet, I've come across other places and people doing this for other categories of things, and think it would be beneficial to get a large list down of all the high quality testers and reviewers in one place. So I'll start off with a comment below with a list of all the high quality reviewers that I've come across for anything and I would love it if you all could do the same!

Caveats:

• I'd like to try and avoid communities centered around a single niche object. First example that comes to mind for this is the mechanical keyboards subreddit. While there's some good information there, I feel that it's highly diluted from everyone else in the community "following what's popular". If there's a specific user that consistently posts high quality information from there though, I'd say that's fair game.
• If I (or someone else) posts a resource that you don't think is a high quality resource, or is untrustworthy, put a comment down explaining why! It's hard to be on guard all the time, so I'm sure I've fallen for marketing (word of mouth or otherwise) plots without realizing it.

I'll include a disclaimer for reviewers or categories that have an innate subjective aspect to them. (Audio & Video would be good examples I think)