Yes, I've been on it for a time. It's only been 4 days that the train was open to public, so I guess I am the first few people who have been on it. Well, if you've ever been on Korean Subway system where chairs are designed to face a person thats across your seat, AREX is exactly like that. There are 2 types of train, express and normal. Express I think is about 7~8 dollars US, and Normal is about 3~4 dollars US. I think theres express train every hour and normal for every 10 minutes or something like that. I took normal train and it took me about 30 minutes to get to ICN. It was not bad, just like the subway in Seoul. There are LCD screens on the wall to show you some TV shows and stuff but it was still quiet boring. (which I ended up listening to my Ipod) Announcements are also recorded in English/Japanese/Chinese so I guess there will not be a problem. I think (from my point of view) only the things to cosider were that there was not much *or any* space to stow baggages (if you are planning on taking those huge bags) and that it takes quiet a time from the subway station to airport building *in both GMP and ICN* (but of course there are esculators and stuff to help you)