I got a comment in one of my previous reviews that I should be testing with a 2.4A capable power supply to demonstrate that the cable is of good enough quality to sustain 2.4A charging, so for this review, I am using one of Apple's 1st party power adapters with a 5.2V, 2.4A charging capability, specifically Apple's MacBook 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 4813mV / 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 = 19 mV ; CC2 = 433 mV
The tw cc command reads the instantaneous voltage values from the CC pins. As you can see here, CC2_PD pin has a value of 433mV. 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!
One more command : > tw vbus VBUS = 4916 mV ; -2439 mA
The tw vbus command uses twinkie's current and voltage meter ability. As you can see, the laptop is pulling just around 2.4A of current at 4.916V from the Apple adapter.
For a USB 2.0 High Speed data test, I’ve hooked my Nexus 5X to my Chromebook Pixel via the My Cable Mart 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 my Chromebook Pixel using the My Cable Mart cable, and verified that it indeed enumerates at SuperSpeed by checking the enumeration messages in dmesg, and that large file transfers 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. It has a black plastic tip. What's remarkable about this cable is that this by far the shortest USB Type-C to Type-A cable I have seen so far. If you are looking for the shortest possible cable for use where you don't need a long cable (for example, if you're looking for a cable for Android Auto, etc), this is a good choice. As was pointed out by the other reviewer, this cable is actually quite stiff, so that may be a negative for this cable.
In conclusion : A high quality short charging and data sync A-to-C cable from My Cable Mart! 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!