Mixed @ 22%, I'm very pleased with it.
The flavor is very good and its as clear as water. It makes mixing almost too easy. Gives me a real China type 555 taste with the thicker vapor one gets from using VG and allows me to use US and UK ingredients for everything but the flavoring itself.
Could be a bit more concentrated but they're working on that.
There's more info here: http://www.e-cigarette-forum.com/forum/diy-e-liquid/101121-health-cabin-tobacco-flavours.html
Thanks! Very informative. I could do without all other flavors if I could just nail that perfect 555.