There are so many authentic drippers that are affordable and relatively cheap I buy authentic.
The quality of the clone rda's I have bought has been pretty lame. Alliance, mutation, Royal hunter, mako, doge are all less than $50. Some much less. The clones I have bought are always a little sloppy. Drip tip wiggles or cap is too loose. That pisses me off and I put them in the junk drawer.
The only clone I have liked was the plume veil.
Edit- however I am really digging my brass nemesis clone from hcigar