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Good value and works fine for importing from XQD & SD cards. One negative is the unit draws power all the time it is plugged in regardless of it being in use or not. This causes it to feel warm to the touch. I just plug it in when I need it then unplug it and leave in a drawer. I’m satisfied this is not a fault with mine as other reviews have mentioned this as well.
Definitely useful accessory for your camera regardless if you have dual SD, dual XQD or mixed (i.e. D850) one. High speed USB3 transfer rates makes it quick to transfer even bulky RAW images. SD Slot has "click lock" mechanism, so it secures inserted card as well as protects from inserting upside down and bending reader contacts, which is common issue with most of the reader adapters. XQD card plugs mostly similar to CF, so there is no need for click mechanism. Overall construction is durable (even for plastic enclosure). You might find 3rd party (less known brands) similar adapters available all around, I have one for CF/SD/microSD which came with USB C adapter I'm using now with this one, but most of them have technical limitations for simultaneous slot use. This one operates both slots the same time.So far, this is single reader tool for my set of D850, D500 and D90. An addition of a USB type C cable would have made the data transfer even faster, but they're easily available and are inexpensive.