Good

Assignments marked very quickly with useful feedback. Good customer support quickly helped with any questions/queries.
Online was okay because it allowed me to dedicate time to other commitments, and could complete the course remotely. Downside was lack of practical experience as there was no face-to-face aspect (I.e. doing online written assignments can’t fully prepare someone for teaching a real life classroom).
Is very useful to have on Cv as most employers look for this qualification to get a ESL teaching job.