Me too. Two trains of thought here.

I knew a guy once who used the e-mill as the staple of his keep. He used variable speeds over different lengths of time. He still did some weight pulling (chains) for distance and time as well as a tire for shorter pulls. He used a flirt pole that was like 20ft. long. He could get the dog to burst back and forth going from zero to wide open for 20-30 feet and then reverse. Every day started with the emill and everyday ended with the emill. I seen several of his shows and his dogs were always in great shape. I gave the credit to the flirt pole but he put it on the emill. He 'believed' it was the emill so for him it was the emill.

2nd was the guy that turned me onto the dogs as a kid. He had a mill with an expanded wire cage built around it and a locking back door. No hook ups, no collars and no harness. He would turn it on really slow and it would roll the dog to the back of the cage. Within seconds he figured out he had to walk. He bumped the speed here and there. Within a couple of sessions the dog really had the idea.
After two, possibly three sessions it was the last time the dog ever saw the emill. The next session was on the slat mill and dog hit it running. He said the only thing the emill was good for was to teach a young dog to run on an off the ground surface. I can remember every 8-10 month old dog came off the chain to get his turns on the emill. Some of my best memories were the dogs just zinging the shit out of that slat mill. For that he gave credit to the emill.

EWO