These are the cheapest USB VAG KKL cables I have been able to find that use the FT232R chip. The FT232R chip is better because it supports internal options for configuring how the chip works, while the cheaper cables with the FT232BM don't. I also prefer the FT232R chip because it supports the FTDI ChipID feature, which all of the NefMoto premium features will use.
So if you want to get a NefMoto recommended cable that will work with future premium features, I would buy one of these two.
"VAG COM KKL 409.1 AUDI/VW/SEAT/SKODA Cable OBD2/II 409"
http://stores.ebay.com/easybid2000"USB Vag-Com Cable/Scanner VW Audi 409.1"
http://stores.ebay.com/alpha-bidI am not selling these myself because there is no way I could resell them and ship them for cheaper than eBay. Also, I would rather working on ECU tuning than run a shipping depot.
The official Ross-Tech cables are also recommended except for the KII-USB cable. The official Ross-Tech cables all contain the FTDI 232R chip. The KII-USB cable is not recommended because it does not support proper dumb mode pass through of data. Also, Ross-Tech states that the HEX-CAN-USB only works with VCDS because it does not support COM ports. The NefMoto software communicates with the USB chip via the FTDI SDK and does not require COM port support, and so it works great with the HEX-CAN-USB.
If you want to check what chip is in your cable, or see if it supports NefMoto premium features, you can use the NefMoto ECU Flasher version 1.6.1.0 or later. Just select the USB device and then hover your mouse over it. It will display all of the info about the FTDI chip in the cable and say if it supports premium NefMoto features.
CH340 based cables (such as those used in many VCDS cable knockoffs) are not supported.