So how "big" is the Ingersoll chipper?

I bought one of the Ingersoll units this summer and it does a good job of shredding garden debris and brush up to about 1". The chipper will chip larger branches up to 3" (if I recall, check the specs) if you can fit it in the narrow feed chute. The one thing I don't like about it is that it leaves all the chips in a pile on the ground and they have to be raked up if you don't want them where you do your chipping.

I also have a 6" self powered Gravely chipper which does a great job chipping tree limbs and heavy brush. I have a lot of trees and after every storm I find myself having to get out the chainsaw and big chipper to dispense with the debris but the small one is handy for grinding up weeds and prunings that my wife tends to leave in piles for me to clean up.

Bottom line, if you are looking for something that will do a lot of chipping efficiently you will want something with a big chute and at least 16 hp--none of the little ones will make you happy. If all you want to chip is the occasional tree limb and other garden waste then the Ingersoll one is a good choice and probably better than any of the other "small" chippers.

I had not used a chipper shredder until I got the Ingersoll unit I have, so my perspective is limited. I really like the shredder part of mine. I use it to get materials ready for my compost pile.
The chipper part works well, but most anything that is too big to run through the shredder goes on the pile for burning, so I don't think I will use that function too much. Most of the wood that I've chipped has just been to see how well it works. I ran some 2-3 year old sassafras wood through that was just small enough to fit in the chute. The chipper handled it okay, without stalling the hydraulic motor, but being dry wood really did push it to the limit, I would say. Green wood chips easily.
Using these things in any case is a noisy and dirty exercise. Hearing and eye protection is a necessity; stuff flies out of the shredder hopper all the time.
Dealing with the debris at the bottom discharge has not been too bad. I just place a tarp there and drag the material over to my compost pile when done. I would be nice to be able to discharge material into the trailer, though. Mackissic has a bag available for the model that is equivalent to the Ingersoll model as an alternative.