I know a few people that have been placed with them. By all accounts, they are very professional, not taking anything from the teacher and actually accompanying them on the interview. Mostly private schools from what I understand, so you'll need a teaching certification or an APRC/OWP.
ACI on the other hand does not vet its clients very well. I ended up taking a gig thru them a few years back and ended up having to sue the bastard they hooked me up with.
Stay away from Jenny Lai, cuz Jenny lies.
Footprints is good for n00bs if you want to work at The Big Yellow School Bux (KoJen). Again, no fees.
TET has apparently closed up shop. But before they did, they dropped their teacher fees, so input from flobsters, however aggressive, worked. I hope they make a comeback. They seemed like decent chaps.
Best recruiter for one's money is still Reach To Teach/Go Overseas.
Good luck to y'all.