I've been on Gratify since Dec 2016. I was hired through Gratify and used it to hire freelancers myself.
Gratify really feels different than other marketplaces. You get a private Slack channel to discuss with your client/freelancer after you are matched. The connection is real and you get to develop a stronger relationship based on human interaction.
Everything happens on Slack, so if you are already using Slack you don't need to interrupt your day to track what's happening on your open projects.