deal1990
The main draw, in my opinion, is that they routinely host interviewers from top-tier companies to perform anonymous technical screens. After which, if you perform well, can expedite you to late-stage interviewing with those same companies. For those with non-traditional backgrounds like myself, interviewing.io gives you a helping hand in bypassing unwarranted resume and recruiter bias. This is especially true if you're competent, as interviewing.io will help shine light on your abilities.
The platform also has routine practice sessions each week to expose you to real interviewers and sharpen your interviewing wits.
I realize I may very well sound like a zealot, but interviewing.io is a must-have in your interviewing arsenal. I understand it is relatively new to the scene, but it's free and at the very least gives you the ability to practice interviewing. For the company rounds, you will definitely be able to start dialogues with some pretty interesting/reputable companies that would have otherwise rejected your application in the ever-present fear of false-positives.
Hope this helps.