The dock is tiny and handsome in brushed aluminum available in colors matching Apple’s three MacBook options, gold, silver and space gray. For Mac users, the Satechi logo and branding on the top may be too much, but you’re in luck! Because USB-C is reversible, you can use the dock, which has an integral connector, either sticking out past the back of the Mac (showing the branding) or tucked in towards the trackpad end, unadorned. The USB-C connection can’t be used for data, only for power.
The dock has four ports in addition to the USB-C pass-through: two USB 3.0 Type-A jacks, one full-sized SD card slot, and a microSD slot. In a previous model of the Satechi dock that lacks the power pass-through, the memory card slots couldn’t be used simultaneously. While Satechi says that’s the case with this dock as well, I was able to mount both card types and copy between them.
The microSD slot is awkward though that’s true of all similar slots. The card has to be inserted flipped (logo on bottom) when the dock’s logo is facing up. I inserted it the wrong way around and had to use a pair of pliers to remove it very carefully. I’d recommend using an SD card adapter (which ships with most microSD cards) unless you can train yourself. The SD slot is also slightly awkward: You only need to push the card in a very small amount, just enough to cover the exposed pins.
I tested the Type-A ports with a reference external bus-powered USB 3.0 2TB WD My Passport Ultra hard drive, and it performed at the same rate as direct USB-C connection, 90 MBps for both read and write. This is about 20 percent off its maximum speed according to sites that benchmarked the drive. (The MacBook’s internal SSD measured 120 MBps for writes and 300 MBps for reads.)
The SD card slots fared just as poorly as they do using Apple’s USB-C to Type-A adapter and a generic card reader: with a “45 MBps” UHS-I Class 10 SD Card, about 33 MBps write speed and 37 MBps read rate and about 12 MBps write and 36 MBps read for an identically rated microSD card. (The MacBook with a card reader sometimes reached 14 MBps for writes, but that’s negligibly different and wasn’t consistently repeatable.)
Weighing in at 0.64 ounces and measuring 3.31 by 1.06 by 0.3 inches (plus a projecting USB-C jack), and costing just $45, the dock is a perfect lightweight counterpart to the MacBook that replaces two to four other adapters and devices, most of which won’t pass USB-C power.