A quick review the Harbor Freight PREDATOR 6.5 HP (212cc) Chipper Shredder. I got mine with a coupon at around $499.
It came mostly assembled and well packaged. Almost all the bolts are 10mm or 13mm, making maintenance easy, and it came with good instructions. This chipper/shredder uses the HF predator engine, which appears to be a clone of a 1990's Honda engine. This engine is very common, and there's a lot of videos about how to maintain, repair, and modify it. Parts are cheap and plentiful. This is normal gas engine, not a two stroke that requires a gas/oil mixture.
I have used it a bunch recently. It's a great tool. I chipped about 15 kitchen size garbage bags of salmonberry shrubs, spruce limbs, and alder branches today, giving the chips to my mom. That represented about 30 minutes of chipper operation, this thing chips fast. The chips are small, less than 1 inch and more cube shaped than flake shaped. I like the chip size and shape a lot.
Only two stoppages, each caused by me feeding too large spruce limbs into the the branch chipper portion. Each was easy to clear, but required me unbolting the back plate to clear the stoppage. This was a good exercise, because it showed me how easy the cutting blades will be to replace- dull blades on a chipper cause issues, those need to be easy to sharpen or replace. No stoppages on alder or salmonberry, even at slightly over the 3" diameter limit. I did not use the larger hopper feeder that is designed for light vines or pine needles or whatever. Just branches.
My mom's husband and my lumberjack friend who was running my biochar barrels as I cut branches were both impressed with the performance of the machine. It starts easy, but it is a pull start like a lawn mower so it is not for the elderly or the physically disabled. It is also quite loud, I equip foam ear plugs under noise cancelling ear muffs when using it. It is moderately heavy, as it needs to be to remain steady while operating, but it has wheels.
I don't like the cheap way the chip collection bag "attaches" to the machine, as it is just a draw cord tightening around the outlet. It comes off occasionally, which can result in the loss of a few chips. I'll make a modification to improve this, but used a bungee cord today. I also don't like the wheels. These squeak and don't turn smoothly when I pull the machine along my gravel driveway. I'll replace the wheels with something better if I have time, but there's no urgency.
I did add a fuel system cleaner to the gas because of condensation in the tank is a real issue on the coast, plaguing all sorts of small engines.
Anyway, this is a great tool. I am using it to fill large raised beds along the contour lines of my hilly homestead, creating terraces and foot paths while clearing out the terrible salmonberry shrubs that choke out everything else and are a real fire danger. With this tool, those become a fantastic raw material.
Here's a link to the chipper
https://www.harborfreight.com/65-hp-212cc-chipper-shredder-62323.html
Highly recommended.