Don't get me wrong, I like c&d's. In some situations they are about the best. What I don't like about them is the knives have to be sharp and spot on to pull brush in effectively. A self feeder will still pull brush in even with dull knives and a .100 gap setting. (Not good for the longevity of the chipper) I'm like you, I ignore the factory settings for the blade gap and set mine at .015. When we do takedowns, quite often we feed even longer limbs than 20 ft. into the chipper. I have run a 30 ft. long 10 inch piece before. With autofeed you just let that sucker go and have about 4 guys grab the next one. Of course that is not the situation that suits the c&d best. For small pruning jobs, limbs no more than 4 inch dia., they are hard, if not impossile to beat. My main beef with them is what I said earlier about the knives and no swivel chute., except for the M&M. BTW the chips you are getting out of your machine are really really good for a c&d, but you will not get that kind of quality chipping palms. For palms a disc with a 90* cut is tops, like the Gravelys and Bandit's 95.