To date my best buys from FT have been a Vamo w/intellicharger (I love this charger), a Protank mini, and a few drip tips (awesome quality and machining). I have purchased other things from them, but they were only acceptable, nothing I would rave about.
My best finds from Focalecig is hands down their Caravela clone (impeccably quality). But I am also happy with their Kraken (love the threaded sleeve), and the Fogger V3. I have another order in transit, but I won't know how it is until it arrives.
I have purchased a stainless steel Rocket from Chinabuye, my only problem with it is that it had a polished finish, and there were a couple of scuff marks on one of the tubes. Chinabuye is very overpriced, so I doubt very highly that I would order from them again.
Desire ecigs has some nice stuff in their Mod/RBA section, but the turn off with them is the $60 minimum order for free shipping. I buy small, but frequently, so that is the only reason I have not ordered from them yet. But I will say that the few customer reviews they have on their site are all positive.
Vaporbreak, I have never ordered from them, and probably never will, shipping costs are too high.
Focalecig and Fasttech are the only Chinese vendors that I plan to continually order from.