This one in particular had some very nice features, some of which are present in Semantic Scholar (my current favourite) but some which are certainly not.
Recommending papers based on citation graphs is a good way to very quickly get up to speed with fields I'm not to familiar with, but I'm always wary that I'll end up back in the feedback loop of very few popular papers rising to the top while perfectly good papers go unseen because they weren't well cited in the year they were written.
So I'll certainly keep an eye on this and give it a try, but I'm certainly still in the market for a "serendipity" slider on such recommendation engines.