I've been using this search engine and I have to say I'm absolutely in love with it.
Search results are great, Google level even. Can't tell you how happy I am after trying multiple privacy oriented engines and always feeling underwhelmed with them.
I think it's great. It's the only search engine where I don't find myself going back the Google every now and then. I'd say the results are actually a lot better than what Google offers. Being able to rank websites higher or lower (or even pin them or block them entirely) is great, and as it's saved to your account, it's basically synced across devices.
It's $10/month for unlimited searches. I tried their limited $5 plan first, but found myself thinking "do I really need to search this?" way too often to try and stay under the 200 (back then I think, now it's 300) search limit.
Their privacy model is mostly based on you trusting them that they don't keep your search history for longer or any other purposes than stated (if turned on), but their business model is clearly based on subscriptions, so it should be fine unless they get greedy.