I bought one of these to load the SD cards for my raspberry pi devices. Works completely fine, at a decent speed. I can't speak to the exact speeds as I didn't test, but it's plenty fast enough for installing linux onto an SD.
The entire build is plastic, and seems pretty solid. Great value for money. Warms up a bit but haven't had any issues with heat.
Something like this would cost more than $70 in a department store. Great purchase.