Well, apart from the constant emails that they keep sending, they are pretty much reliable!
But if you’re planning to sign up on their site, make sure you create an impactful resume beforehand as there are thousands of people on their site. Try using @SuperResumeBuilder . You can create pretty nifty resumes with their app.
The reliability has gone up as more and more recruiters have come on board since past few years. Register on the site by correctly choosing the values in the form. You have 3 different ways to complete your registration.
a. You could use the resume parser way if you have a resume handy with you where you upload your resume in the beginning, they would parse the resume and prefill most of the fields in the form asking you to confirm the data.
b. Incase you don’t have a resume you could use the resume builder path where you just fill up the form and the resume automatically gets created.
c. Or you could go the traditional way by filling up the form and also uploading the CV.