Sylvis Halpern (on Myrtle the Turtle) has an Ecospeed system on her GreenSpeed trike. About a year and a half ago she rode from Portland, Oregon to Los Angles, California. Then last spring she continued East to Texas, up to Kentucky (I think) and meandered back to Kansas until a failure in the IGH terminated the ride. She was planning to terminate at the time anyway because she wanted to be back in Portland for something.
Anyway, she has never been very active on this forum, but her blogs are quite interesting:
http://www.myrtletheturtle.me/Main%20Pages/myrtletheturtlej.html