For my first test, I've got the Coolreall USB 3.0 Type-A to Type-C cable plugged into an Apple proprietary Type-A charger, the 12W iPad charger.
The Type-C end is plugged into Twinkie, acting as a pass through to Chromebook Pixel 2015. Picture attached!
First let's run the ectool command from Pixel's command line to check what Pixel thinks is happening on its USB-C ports : localhost ~ # ectool --dev 1 usbpdpower Port 0: SNK Charger Proprietary 4606mV / 2400mA, max 5000mV / 2400mA / 12000mW Port 1: SRC
So far so good. Pixel identifies the charger as a Proprietary type adapter, and has negotiated 2.4A of charging.
Let's see what Twinkie (the USB PD sniffer) says : > tw cc CC1 = 8 mV ; CC2 = 435 mV
The tw cc command reads the instantaneous voltage values from the CC pins. As you can see here, CC2 pin has a value of 435mV. Referring to the USB Type-C Specification Table 4-25 Voltage on Sink CC pins, this voltage falls right in the middle of the range allowed for vRd-USB, meaning that yes, this USB cable has the correct 56kΩ pullup resistor!
For a USB 2.0 High Speed data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the Coolreall Type-A to Type-C cable to test large file transfer via MTP. It just works, no problem!
For a USB 3.1 SuperSpeed data test, I've hooked up my Pixel C to a Windows 10 laptop using the Coolreall cable, and verified that it indeed enumerates at SuperSpeed using the USBView.exe debug app, and that large file transfers over MTP are stable. This is a great cable to have for MacBook users especially who want to use Target Disk Mode, which requires a SuperSpeed capable USB cable.
Now for more subjective judgments of this cable : The Type-C plug on this cable is a stamped metal part that's been wrapped around to the shape of the plug. It does have a seam on one side.
In conclusion : A high quality charging and data sync A-to-C cable from Coolreall! The cable is a great safe way to charge and sync newer USB Type-C devices such as Nexus 6P/5X or Pixel devices with your old Type-A equipment. It is future proof for fast charging USB Type-C devices to come, as well as future proof for USB 3.1 SuperSpeed devices!