You will be able to take on 5 to 8 inch trees as you described with ease. It will take that brush like a hot knife through butter.once mastered you should be able to clear 5 to 10 acres in a 6 to 10 hour day. Do not sell the big Bobcat short, it's a big powerful machine and flows hydraulics very good. I assume it's a high flow machine. Keep the disk out of the rocks and dirt, your tooling on the disk will last much longer. AFE sells replacement sets of head tooling, i suggest you get ond with your purchase. Visibility is what this type of head gives the operator. You need hold the head at a slight tilt, the brush will be cut and feed itself into the spinning disk and cut in down to very small pieces that decay quickly on the ground. I own and operate both styles of mulchers and prefer the AFE over the others due to less maintained and better operator visibility and control. You tube has a bunch of good video's that show the capability of the unit and the style in which it should be operated. I just put on one a high Flow 259 D CAT and even the smaller unit works extremely well. Go yo the AFE website and watch a few of their own video's, they clearly , accurately and honestly show what their product can do...hope I answered your questions and don't second guess the AFE mulch , it's a great mulcher IMHO.....
