I have a Wood Pro AVP PTO-driven
chipper/shredder. It is distributed by Vandermolen Corp. in New Jersey and cost me (last year) about $4,800. It is a well made and very powerful machine and the folks at Vandermolen were helpful and nice to deal with.
It doesn't have power feed, but doesn't need it since the feed hopper is slanted down and that plus the action of the
chipper knives draws material in by itself. Does a good job on anything up to about 5". Above that, and even a bit smaller, I use for firewood anyway. Last summer I chopped up a brush pile that was 30'x20'x10'high in less than a weekend.
I also like the design because the hopper placement and dimensions are such that it is virtually impossible for you to get any body part near the blades. I think that
chipper/shredders are among the most dangerous attachments that CUT owners use. The cutting/shredding disks are 30" in diameter and I figure that they are spinning at over 2500rpm so you don't want there to be ANY chance of gettin' sucked in!! /forums/images/graemlins/shocked.gif
Another thing you want to be careful about is that if you want shredding as well as chipping capability (for soft vegetation) make sure that the machines you look at have both. I found that quite a few PTO machines were strictly chippers and not suitable for processing leaves and soft stemmed materials.
Hope this helps.