Finding qualified participants for research quickly is often a barrier to doing user research. Ethnio empowers teams to do intercept/time aware research and share sophisticated screeners so agile teams get past this blocker. As a recent example, I shared a screener on Craigslist and Twitter and in 3 days, had over 225 qualified recruits for my research and scheduled 40 of them to support standing research in our sprints and iterative design cycles. I've been using Ethnio for 8 years in professional and educational capacities and I've been super impressed with how much the product has grown to accommodate needs of the research community while maintaining a support team that is as fast, friendly and supportive as ever.

The ease of managing and paying incentives to users.

I love how they know what the research process is like. Their features are tailored towards User Researchers, so I find that to be extremely helpful. I also really like how you can easily manually confirm users, reinvite users, etc.