In brief: stay away. Pay is abysmal at 6000 per month. Granted they throw in a flat, but unless you're lucky and get placed in a newer place, you'll be in a dump. They charge you a monthly maid fee which you can't opt out of. For said fee, you'll be lucky if anything other than the floor gets swept and some dishes washed. Dusting, mopping and actual cleaning apparently doesn't make sense to their cleaning lady who also happens to double as the cook, so you're essentially paying for your meals on Saturday (which is no more than slop drowned in grease).
As far as anything academic goes, no one has a clue. The 'senior teachers' offer little in terms of support and nearly all the other employees are as green as green gets, haven't got a clue and are just happy to be somewhere other than the US or Canada. Training? Forget that. Peer observations? Forget that too. Feedback on your performance? Unless you consider 'talk louder' and 'do more TPR', well, nope. There is no Western management any more as the headmaster has apparently relocated to the US. The Chinese staff left in charge are about as clued up as your average mentally handicapped child. They haven't got a clue what's going on.
Parents sit in on all the classes and seemingly complain nearly non-stop about everything, which you'll never understand unless you happen to speak Chinese. The teaching assistants (i.e. babysitters and tattlers) barely speak passable English save for a few, don't know anything about teaching and attempt to run every class as if it were their own. They try to tell you what to do and how to do it and if you don't comply, you're in for problems and 'not being liked'. Allow it… Schedules change willy-nilly and there are four of five different branches (I can't remember at the moment) so you could very well spend a good chunk of your Saturday and Sunday zipping around Jilin with no prep time in-between and nary a moment to get something passable to eat.
Classes are mostly very young children to kids. They offer some 'IELTS prep classes', but they haven't got a clue about IELTS nor do they have any materials save for some ancient, photo-copied books that they use for rote grammar work. There's zero synergy between the four classes (reading, writing, listening and speaking) so don't expect the kids to learn anything, other teachers or the assistants to know anything and damn well don't expect to do anything remotely suitable for a proper IELTS classroom. It's a joke. There are no adult classes at all.
The only positives I can say are the fact that they'll sort your Z-visa, residence permit, medical check, etc. without issue. The FAO guy there is helpful even if he's a cocky, snobbish prick. Jilin itself is lame, boring and grey. If you're not an avid drinker or alcoholic, speak Chinese well or enjoy being in the middle of nowhere with nothing to do, stay away at all costs. If you actually try and do something, you'll quite possibly be singled out, isolated, lied to and stolen from and end up hitting the road early in the end.
Also, any holidays you're promised aren't really holidays. You're expected to make up all the classes missed during the camp weeks. You won't be getting any extra pay for this either. The schedules are adjusted for public holidays as well, so you end up making up any classes missed either before or after. In other words, you work for your 'holidays'. It's abysmal.
You've been warned…