I just bought the WW HOTAS and got it with the 15EX throttle grip. I wish I hadn't now. They added too many switches and changed a few too. I should have bought the 15E throttle gri if I was going to fly the HOG. The WW 15E is just like the HOG and 15E. It has the proper radio, boat, and speed brake switches. The 15EX doesn't.
Since WW sold the HOTAS as a Warthog. It should have come with the 15E throttle with no other options.