When I first started vaping and bought an ego like device and some juice at a grocery store. I got home and I ordered some Hangsen. No coffee flavors but Strong Mint and USA Mix (tobacco) direct from China. And correct me if I am wrong, but aren't they very high in PG? They don't give the ratio it is mixed with, but it seems very high to me. I never ordered anymore Hangsen and I still have those bottles which are still almost full. Hangsen taste like it has a lot of chemicals in it to me. The good news is that I don't think that stuff ever goes bad. Taste the same as it did a year and a half ago.
They are only 20% VG at most from a BS test I ran by dripping one. The coffee flavor reminds me a lot of the 2009-ish Blu Java cartos. I think that's why I like it. The flavors Hangsen makes are quite nice though in DIY recipes.