This company and the TEFL course I did change my life. The course is so thorough and easy to understand and is a true guide to a successful online teaching career. I have seen others and it doesn't compare. If you want to know which is the best...i-to-i TEFL is without a doubt! The assignments are hard which sets the high standards I prefer. The ultimate resource pack is a must. I am still using it as a reference and a backup since memory fails us sometimes. Customer service at i-to-i TEFL is superb. They are prompt to reply (considering time differences) and have exceeded my expectations every time. I recommend this company with pride and thankfulness.