Helpful and fun
I’ve completed the onsite course in May 2017 with these guys. The course was fun, interesting and very educational (I didn’t realise how bad my grammar was and they helped with that also. Pretty bad for a native English speaker). Instructors were very helpful in all aspects, even things not related to the course and now I am proud to call them my friends. I’d highly recommend considering ISTESOL if you are thinking of completing a TESOL certificate.