I don't plan to do anything intensive except clone my MacBook Pro's SSD, so the speed is very good. The cable includes a USB A to C converter for legacy systems. The only complaint right now is that it gets pretty hot under heavy use. Not hot, but I wouldn't put it in your lap. Also, the USB A to C converter is specially attached to the cable. Basically, you can't use it with other USB cables unless you physically change it.
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