It’s interesting. I tend to use it as my fallback when ddg doesn’t find what I’m looking for. Prefixing the search term with !s gets me there easy. Start page is supposed to be the same search engine from google focused on the EU and without tracking and stuff. Whether it actually is that, I’m not sure. My biggest gripe is they default to open in new tab for search results.
I started using Startpage after reading @bowline’s recommendation a month ago, and it’s very good. I have DDG as my default browser, but very much prefer the Startpage results. I should change it to default.
One nice advantage of StartPage over DuckDuckGo is that you can search within the last year. For some reason DDG limits you to past day/week/month, but I find I use Past Year quite a bit, especially when looking for product reviews.
StartPage also lets you custom-configure how you want results, and it gives you a custom URL to use (instead of sticking a cookie in your browser): it lets you configure search mode, theme, number of results, and more. This is also useful if you don’t want to make Startpage your default search engine - you can just bookmark the link and use it when desired.
While Google is the backbone of Startpage, and Google and Startpage have a contract agreement with each other to obtain Google search results in privacy, Startpage also adds in results from additional sources, including things like Instant Answers.