I use it now as the main research engine. I bought multiple Amazon gift cards over the last few months, there are other options but amazon is the easiest (depending on how much you search, you can get a 5 euro card every 5 weeks or so)
You can use my link to get a sign up bonus: https://rewards.bing.com/welcome?rh=657B1CDF&ref=rafsrchae&form=ML2XE3&OCID=ML2XE3&PUBL=RewardsDO&CREA=ML2XE3