Definitely worth it

I am a 6th generation TaLK Scholar and even though I initially came over on a 6-mo contract I decided to stay an additional 6 months because I enjoy teaching, and I enjoy being able to learn about different cultures (coming from someone who has been to 12 other countries besides Korea).
While the pay rates are less than what an EPIK teacher would normally receive, as an internship it pays well, and usually you are given some extra time to explore Korea--more than what would be allotted to an EPIK teacher. And the pay is more than substantial for living inside of Korea and saving some money for going back home if you spend sensibly.
The 4-week long orientation, while long, is very helpful for giving you time to adapt to the different climate in Korea as well as the food if you're not used to eating it. It also gives you time to bond with the other members of the programme and set up a support system where you can learn to be independent and dependent on each other when you really need help or just need someone to console you. Remember you are not the only one away from home--you're all in it together even if your individual experiences are different.
This programme definitely is for a good cause. You (the participant) are helping the next generation of children to have a chance at a better future by helping them to become bilingual (or even multilingual) and exposing them to life outside of their usual comfort zone and at the same time you are earning about them and the way they live in Korea.