I wanted to share my experience in Shenzhen because it might be helpful when choosing a school. I worked for Meten at the Hongfa location.
Lets start with the pros:
I loved teaching and I loved the students. I lost more than 26 pounds while I was there. Ok that's about it.
So here's the cons:
I was never given my release letter, reference letter, or work permit cancellation at the end of my contract. Even after I gave reminders several times. I also never got my bonus even though I met the requirements and on a couple occasions they didn't pay me for overtime. Sometimes payday was delayed too. Also, texting me at 11:30 pm to change my schedule or just not telling me at all. Doing 4 to 5 ishows a week when we're only required to do 2. Some staff refused to help students after enrolling them. Unpaid mandatory meetings on my days off and always denying my vacation requests. No A/C in the building half the time. The HT would never say thank you for all your hard work etc., etc., etc. A couple of the FT's broke their contracts and left early. I've seen some of the LT's work just a few days or a week and quit. It has a high turnover rate. That raises a red flag. Just bad bosses. It could be a great school but it's not.
And some additional comments:
By the end we were all just going through the motions. There was always a dark cloud over our heads. It was hard to be positive and optimistic. I'd hope it's only the location I was at. Is every location this way? Maybe that's the business culture.
Choosing the right school will make or break your experience in China so think twice.

After reading some of these posts I feel like what happened to me is not such an anomaly. I had a director who would work me through the whole day and not allow me time to eat. She was hands down the worst person who I have worked for and I've worked in the UAE. People were not getting paid, the school was dangerous to children (five flights of stairs for kindergarten) and outdoors. I felt awful for the teachers and the treatment. But, not all schools in China are like this. I worked with some wonderful schools with highly dedicated and professional staff. Do your research but don't shun the whole country.

Chinatowns around the world smell as Chinese as the "International Schools" in China. Money laundering, corruption and a complete disregard for the corporate social responsibility are evident but ignored for reasons. What Chinese offer to our economies is difficult to refuse just as it is to turn a blind eye to opportunities in China. Chinese want to make money and then take care of their money in similar ways we want. Just imagine what kind of young people all those "International Schools" in China produce and what sort of western educational institutions accept many of those young people from China. Even our public universities are bending to those applicants with money. Anyhow, your regrettable experience signifies the situation that we're living in.

Skybar Online English School-Beware of them and give them a wide berth. They are dishonest, do not pay their teachers, and have an abysmal record for this. The horror stories I have heard and experienced from them could fill a book. Be ready to be insulted, ripped off, and left in the cold ! Good luck out there !

I tend to agree. I got the impression from the director that she was not impressed by 'Western' teachers. She set up an interview with me, and was 30 minutes late. On the second interview, again, 30 minutes late. While talking to her, I came to the conclusion, she wanted teachers whom she could control. Perhaps, be in fear of her. This is a typical mentality by many administrators in the ME. I would not recommend native English speakers to HUBS. It is just my humble opinion.

BR Language School, Phetchaburi (Thailand) [Teaching Agency]

Please be warned: Never sign up with this company! They deduct 20,000 baht from your first month's salary (calling it a deposit). I've now completed a full year of teaching (May 2013 until February 2014). I have asked for my deposit back and now, shock horror, they REFUSE to give it back!

Also, you will be out of work for 6 weeks in September/October (no pay). They don't pay for sick days either. They are the only teaching agency to deduct a percentage of your salary for so called tax...

If you try to contact them it’s nigh on impossible: they’re rarely at their office; they don’t reply to e-mails; and they very rarely answer the phone or sms u back!

I know of many past teachers who have worked for them who have been treated very badly too. It’s much better to apply directly with the schools in the area. Please stay well away from these cowboys!!!