Enfly refunded us the full visa cost with our first month's bursary. We will receive 5000RMB flight allowance at the end of the contract (which is often more than the cost of flying out here if you are a savvy shopper.)

You're certainly not a savvy westerner! 5,000 RMB flight allowance is bottom of the barrel for a two-semester gig in the PRC! Other employers here pay from 7,000 - 10,000 for same, if not the full return flight reimbursement! And 1/2 for a 1 semester gig!

Source:

http://answers.echinacities.com/question/has-anyone-had-experience-recruiter

Has anyone had experience with the recruiter?
This recruiter goes by 3 different names: Enfly Placement, Enfly Education, and Enfeecn.
The recruiter is out of Chengdu and offers as much as 10,000 RMB per month which seems to be unheard of in Sichuan.
If you have any experience with them (good or bad) or know why they go by 3 different names, I 'd like to know.
Just doing research. It is the time of year many recruiters get desperate about finding a foreign teacher. Not because there is a short supply, but because many just don't prepare and find themselves with allot of business they can't handle. This in turn is caused by the schools that wait until the last minute to figure out how many teachers they will need. ( yikes it's August 28 and we need 4 FTs to start on Sept 1) The schools must think we spend our summers in China.

Are YOU being underpaid?

I have 3 questions for you:

i)Isn't it true that your contract stipulates NO NEGATIVE disclosures re your employment at Enfly?
ii)Do you agree with me that if Enfly provides a teaching assistant, and the workload is < 21 classes/week, a native speaker should be on at least 6,500/mth? (no initial couple of months'reductions due to probation, btw!)
iii)Don't you agree that if no teaching assistant is provided, your salary should be 7,000 - 8,000 a month?
iv)The 2,200 - 2,600 RMB travel allowance is being paid to you in 2 instalments, each at the end of each semester, isn't it?

Please bear in mind that Enfly's client schools will be receiving around 300 RMB/academic year for an FT's classes from each student. So, the money's there!