I've been using it exclusively since beta and am completely satisfied! The key improvement for me over other services is the ability to boost and block domains—it comes with a decent set of filters for the worst offenders (I've never seen a GitHub issues or StackOverflow mirror), but it's two clicks to block a domain that I personally don't like seeing. Pinterest, geeksforgeeks, and a bunch of other low-quality high-SEO sites all get permanently blocked for me, which is a huge quality of life improvement.