I ordered an RX200 and a TFV4. While I believe this site does sell some clones, it will tell you if its authentic or not. Look for the green tag that says "100% Authentic" on the individual product page. It took a full 14 days to arrive, the website did say 7-15 days but I got pretty nervous when it took 5 days to leave China. In the end, it finally did arrived and all the serial numbers checked out authentic on Wismec and Smok websites. I spent $73.42 including shipping for the two items, well worth the extra two weeks considering my brother paid almost $300 for the same setup! As you will see from my tracking info below, I ordered it back in April and here it is end of August and I'm still vaping on this setup daily with zero complaints. Yea it took two weeks, China's freaking far away, duh....
I use an app called TrackChecker Mobile because it downloads info from all carriers domestic and international. Sometimes it seems like your package isn't moving but in my experience its usually because USPS can't access international data so they don't know where it is until they get it themselves. There's other apps that do the same so if your going to order international you should look into them. Here's my actual tracking info, though I did mask some data. (typos are theirs, not mine):
LS83436****CN
4/29/16 7:28 PM - Posting, GuagDongShengShenZhenShi JCYX
4/29/16 7:28 PM - Accepting, CHINA
4/30/16 11:52 AM - Processed Through Facility, SHENZHEN EMS, CHINA
4/30/16 1:02 PM - Despatch from Sorting Center, GuangDongShengShenZhenShi SHENZHEN
5/4/16 10:25 PM - Origin Post is Preparing Shipment
5/10/16 10:54 PM - Processed Through Facility, ISC CHICAGO IL (USPS)
5/10/16 10:54 PM - Arrival at exchange office, çľŽĺ›˝čŠťĺŠ ĺ“Ą
5/10/16 10:54 PM - Arrival at Sorting Center, UNITED STATES OF AMERICA USUSORDF
5/11/16 10:32 AM - Arrived at USPS Facility, CHICAGO, IL, 60701
5/13/16 11:06 AM - Arrived at USPS Destination Facility, FORTH WORTH, TX, 76161
5/13/16 11:08 AM - Departed USPS Destination Facility, FORTH WORTH, TX, 76161
5/14/16 6:45 AM - Arrived at UNIT, *MYTOWN*, TX, *****
5/14/16 7:03 AM - Sorting Complete, *MYTOWN*, TX, *****
5/14/16 7:13 AM - Out for Delivery, *MYTOWN*, TX, *****
5/14/16 11:25 AM - Delivered, In/At Mailbox, *MYTOWN*, TX, *****