Thunderbolt 3 to Thunderbolt 2 What is the best way to connect a device with a Thunderbolt 3 (USB Type-C) port to a computer (MacBook Pro) with a Thunderbolt 2 port?

I understand there will not be full 40 Gbps speed.

Device is a http://www.amazon.com/dp/B01BL0CKIM/ref=cm_sw_r_cp_api_D1BFxb33TZ5ZM
There isn't really many alternatives on the market. USB-C to Mini DisplayPort exists, but not many with Thunderbolt 3/2 support.

Apple makes a Thunderbolt 3 to Thunderbolt 2 which is supposed to be bidirectional (read more in this support article). In that case you would probably need a Thunderbolt 2 male-to-male cable, but it should work in theory.