I own an 11.5 Dr chipper, bought it used, it's not a self feed.
I'd think hard about what you need.
I take mine places, so even if it's not quick it's much quicker than taking three loads of brush. I can put it on a trailer and chip right into my truck, I know some of the other budget options chip straight onto the ground. I use the chips, around the yard, around my daughter's playset. I don't chip the large stuff, I cut anything 2.5 or 3 inches into firewood and it's pretty good up until that diameter.
I'm not sure if I'd be sold on a self feeding 11.5. It'd be really nice on small stuff but on the big stuff it's actually nice to hold it back and let the engine spin up, I think it'd have to have more power to make it worth it or you'd have to go through a ton of small stuff.
I've used a tow behind Vermeer and it would chew up anything and it cost about a third of my house. I've used a tow behind Wallenstein, on small stuff this thing was perfect, would feed really well, engine power was good, on 3-4 inches, well within it's capacity, it was a joke. Stalled itself non stop. 10-15k machine, I know if I had bought one without ever using it I'd be more than a little upset.
Now, if you only see the chips as a useless byproduct, you never need to take the chipper anywhere and always cut at your place, I really can see a case being made for just dragging it and burning it.
Hopefully that helps you make a decision for your needs.
