I don’t particularly enjoy listening to audiobooks in English - it’s been a few years since I last listened to one - but I do feel they’re unbearably slow. I have the same problem watching youtube videos in English; I usually watch them at 2x otherwise I get annoyed. 
So after reminding myself that Storytel existed, I ended up signing up and trying it out.
It’s a monthly “unlimited” subscription, so you can stream as much as you want. Unlike Audible JP, there doesn’t seem to be an option to buy titles individually. I didn’t have any problems with payment, and it doesn’t seem like there’s any regional restrictions.
As part of the sign-up process, you choose the language you want from the several they offer - I picked Korean, but I can also listen to English and Chinese audiobooks. In the settings, you can select which of these languages you want to be displayed (I’m only interested in Korean, but can select all three if I want).
I don’t know if they offer this if you choose another language - perhaps they always offer English titles alongside whichever language you choose, but it would be interesting to find out what other languages are paired up (I’m assuming if I had chosen Chinese, they’d have given me Korean, too).
Although you can browse their catalogue online, you can only listen using the app, which is a little annoying. They also offer ebooks, although not a huge amount (in Korean at least).
I’ve come across several titles I was planning on buying on Google Plus, so I’m happy about that (especially the Harry Potter books - the price for the Korean audiobooks on GP are shocking).
I’m liking it so far! 
