I've been doing this for years now, it works even better for niche products (or not massively produced). The last example was the Smarthalo, a friend of mine asked me what I thought about it as I'm into biking, I had seen some ads and their Kickstarter campaign but didn't give much thought, the only way I could find reliable user reviews was by appending "site:reddit.com" after my Google Search as the other user reviews would be from Amazon or other e-commerce websites that I really don't trust.