I have not tested throughput to confirm max TB3 but this cable is made of a lovely soft coating that is pleasant to handle and makes it easy to coil it back up. The connectors appear to be of good quality. This cable is capable of carrying power to my MacBook from its power adaptor. Very happy with the purchase.
I've got an Akitio Node Pro eGPU with a Radeon NITRO+ RX VEGA card in it. The cable that came with the Node Pro was a bit short (0.5m). I bought the 1.5m 40GBps cable from here and it worked great. Ran 3DMark before and after switching cables and performance was the same. Good job Monoprice.