All over, actually. I trawl forums, review blogs, & news articles. The more the better. "Professional" reviewers in particular fill a gap- some of them have ha

All over, actually. I trawl forums, review blogs, & news articles. The more the better. "Professional" reviewers in particular fill a gap- some of them have had their hands on just about every <vacuum> ever made, so they can provide something frequently lacking on storefront reviews, an opinion well informed by experience with many alternatives. I also like sites like DxOMark, which provide raw test data that you can review yourself. The main theme though is just, many sources. Any one person can be bought, but not the whole internet.