I was disappointed, because I really wanted them to succeed for so many reasons. But scheduling was a nightmare, because going through a third-party, by definition, will always be less efficient than speaking directly. Also, after a while, this pattern emerged:
1) They call me (or send me an email), asking me if I could take on a student for $SUBJECT (usually Python or Machine Learning).
2) I respond and tell them that I can
3) I never hear back from them
I imagine they were calling multiple tutors and trying to find a combination of low price and good reviews, and then recommending that tutor to the student, but this process was incredibly frustrating.
I eventually just stopped responding to their emails and phone calls, because they had a lower signal-to-noise ratio than unsolicited recruiter emails sent to group mailing lists!
Also, their payment was handled entirely through Paypal, and I would have to send them an email to tell them that I had tutored the student (so they could pay me). I almost never logged into the website. For a tech startup, it was surprisingly reliant on old technologies. Not that this is necessarily bad, but for a market of college students and (primarily) young tutors, this is a poor fit.
Finally, they cut they took was HUGE - 40% at one point! That's more than I pay in taxes, and I live in one of the most heavily taxed cities in the country! On the very first day, my first client asked me before leaving if I would be interested in continuing tutoring outside of Tutorspree if we could split the difference.
That is a very bad sign for any agency or marketplace: if the fees are so high that they actively drive away repeat business, you're walking up a down escalator.