100% recommend going with Korean Horizons if you're applying to EPIK. Alistair has been such a help with a such a stressful and time-consuming application.
I think the best part about applying through Korean Horizons specifically is how attentive Alistair is to every application. Everyone gets a practice interview (with advice that is invaluable) and he replies to your emails very quickly with all the answers you need.
Alistair continues to offer help and support for the duration you're in South Korea.
What is your advice to future travelers on this program?
Save yourself the extra stress and time, and apply with Korean Horizons.