I switched to Ecosia about a month ago. IMHO search result quality is at about 90 % to 95 % compared to Google. I believe Ecosia is using Bing in the background. They are planting trees and claim to respect my privacy. Overall I'm happy with Ecosia and started recommending it to friends.
PS. I'm German and do searches in German and English.
PS. I'm German and do searches in German and English.