Like the previous poster said... if you like the taste of Dekang RY4... then try Ikenvapes...
IMO, it's worth the extra... Chinese juices are fine... lower quality base IMO than many american vendors... but flavor is great...
You should read the RY4 Roundup thread... it has a lot of opinions and useful information.
RY4's have increasingly become each vendor's secret caramel/vanilla/sorta sweet tobacco vape...
and billherbst's thread helps you pinpoint the ones that are more in the scope of the original taste and what else interesting is on the horizon...
http://www.e-cigarette-forum.com/forum/e-liquids/193327-really-big-ry4-roundup-long.html
I like...
The original... Ikenvape's, BWB, nHaler's, Taboo, Dulcis... and juices like boba's, bounty hunter and love from above are also interesting