I received 4 days ago 3 of these products and they work BUT if you are on Mac OS X prepare yourself for some pain if you want to upload your sketches.

The first thing to know is that even on Windows, the USB Serial driver for these arduino (CH340g) isn't integrated by default in the OS (named USB2.0-serial in both System Profiler for OS X and the Device Manager in Windows). You will need to download the driver on the manufacturer website :

http://www.wch.cn/download/CH341SER_ZIP.html

then extract the archive and finally update the driver in the device manager by pointing to the extracted folder. I tried it, after that it works great.

Here comes the difficult part for Mac OS X: you can download the driver (for 10.11 and prior versions of OS X) here:
http://www.wch.cn/download/CH341SER_MAC_ZIP.html

BUT BE ADVISED !! I strongly recommend you to NOT download and install this driver because although it works and allowed me to upload sketches with the Aduino IDE, it randomly throws a Kernel Panic error wich restart your computer when you connect the arduino on the USB port, which is really NOT COOL when you have unsaved work opened and your computer restarts without warning !! I tried it on 2 computers (10.10 and 10.11) with multiples arduino Nano and I encountered the problem on the 2 machines, although it was more frequent on my early 2009 iMac than my 2013 MacBook Air. I searched the Internet and found other persons with the same issue as me, with no solution.

IMHO the best option to upload sketches on this Arduino Nano with a Mac is to install VirtualBox on your Mac and then install Windows in a new Virtual machine. I tested it and I could upload sketches in the arduino Nano (the only problem is a stk500_recv error at the end of the upload but the sketch is really sent, I confirmed it multiple times. Tried the Serial Monitor too and it seems to work OK).

Note that if you installed the driver on Mac OS X and want to uninstall it you will have to remove the file usbserial.kext in the folder /Library/Extensions (library at the root of your system, not the one in your personal folder) then reboot.

I really hope that this message will help others (Windows and Mac OS users alike). In the end, note too that I'm not sure all Arduino Nanos sent by Banggood have the same USB chip as the ones I received (product description speak of a new version without soldering and in my case I needed to solder the pins provided with the product).

I recently bought a few Arduino modules from Banggood. I am very pleased!! NRF operates more than 1.5 km. in a straight line.
Arduino nano is perfect. I can buy them in my country too, but they will be 3 times more expensive and of the same quality! For my projects
this is the online store. RECOMMENDED!