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After reading that some posters had issues with the old style heel slings, I had the dealer leave them off when setting up my new Rover. Big mistake. I received the new style heel slings (although the website still showed the old ones) and I believe that any issues the old ones may have had are gone.
I used just the standard pedals for the first week. They work, but once I added the new style heel slings I seem to have gained pedaling power. For most of the stroke I feel the pressure on the ball of the foot. Once I pass fully extended, the heel sling continues to pull the pedal at least half way around.
Wish I had known this from the start. As a new trike rider, and having been off bikes for over 20 years, these slings help get back in proper form.
I feel TerraTrike got it right with this product.