I have 2500hours logged behind an 1800a that i purchased used off this site. I was trained were the danger zones are and what constitutes dangerous behavior and attitudes when chipping and how to get the most production out of the machine by a large cooperation. Now running my own company, i have had guys chip everything imaginable: rope, tarps, rakes, a metal scoop, a plastic scoop, and who knows what else, but no people. that is because of one simple rule and i have had newbies, vets, and everything in between loading brush into that chipper. my one constant is this: we don't allow new people to chip by themselves, green or vet, until the new hire proves that they can use the chipper properly, i.e. no rocks or dirt, no tools around the in feed, no body parts around the in feed, where the in feed controls are, how to stop it, how to slow it, what is auto feed, how does auto feed work, when doesn't auto feed work, where are the danger zones, what the chipper is supposed to sound like, what does the chipper sound like when there is a problem, how to clear all the different jams safely, how to clear a stuck piece in the drum ( which is not putting a piece in like a splitter that will only make the jam worse. you must chip a BIG log 16"-18" in diameter maybe 4' long hardwood. that works every time), how to maintain it, how use it to its maximum performance, how to cut and dice pieces while maintaining safety and production, knowing what to chip and what to slab and throw in the back of the truck, how to load it with a crane, how to load it with a grapple truck, how to load it with a mini skid, how to load it with a grapple loader, where the crush points are, where are the safe zones, when to say no. If the person operating the chipper cannot do all those things then someone else needs to be around for the newbies safety and the machines safety; this goes for any chipper. I run a three man crew and i really don't like chipping until the job is close to being finished or the brush just has to be processed. I have made a lick with that chipper and have found a good chipper operator is hard to find, but when you do hold on to them and they will train the rest and make you money.