I've been using Deans Ultra for the battery to ESC connection. I tried the Astro zero loss 3 pin
between the ESC and Motor. It's rated for 50 amps continuous and 75 amps for 2 min periods. I wanted to be able to swap motors without soldering. I've never felt it getting hot yet.
For the life of me I can't figure out why Deans hasn't come out with the polarized 3 pin version for the motor/esc connection. All they have to do is add one more pin to their existing design.
Here's a shot of the setup.