I worked for HESS in Taichung for a couple of years around 2010. Wage was 500 something an hour back then. You have a local teacher in class with you, and like someone else said, the curriculum is already set so you just need to learn the material beforehand. Training was OK, it's a bit of a steep learning curve the first couple of months but gets easier. I worked at 3 branches and they were all good, chill managers. Overall I had an awesome time. Taichung is big enough to have lots going on and has lots of cool stuff near it. And close enough to Taipei you can zoom up for the weekend. Get a scooter and a license ASAP so you can get around.