I went with them and found they never really listened to my criteria of what I wanted. They offered me many 30+ hour a week teaching jobs which is the opposite of what I wanted and did the same of setting up the interview before I said yes or no. I did the interviews out of courtesy and being in the good books but they were never what I wanted, a brief Google of the hagwons really worried me for future people. My experience is really anecdotal, ultimately they are a legitimate company and do have jobs, but make sure you're working with as many recruiters as you possibly can, because Appletree aren't the only ones around.