They contacted me to let me know they listed my app and are asking for $100 for a premium review. Has anyone used? Noticed an uptick in downloads because of them?
I've not tried them, but you can give it a try if they also "send their latest reviews" via email, social media etc. to their readers; that gives you a visibility. Their site SEO score is good also; so once they publish review, you can link that up on your site and try spreading the content across reddit etc.
I run an app development company www.agicent.com and we hear such stories from our customers frequently, some benefit and some don't. The best way to get early traction is any kind of press review, its hard to get but if you put your energy and time to woo journos then you get great chance.
A lot depends upon what kind of app you have also, appzoom is apps specific but you can contact with sites related to domain of your app and it can get more specific readers.