I first bought the Agri-Fab 45-0530 and was disappointed. It's very cheaply made, especially the key part: the flow control mechanism. So I shopped and found the Chapin, which is almost twice the price. However, everything about the Chapin 8622B tow spreader is significantly superior to the Agri-Fab 45-0530. It’s like comparing a Yugo to a BMW. The Chapin is solid as a rock; really heavy duty constriction, made to last. It’s farm grade. When unpackaging, I examined the parts closely with glee. I kept hearing my Dad’s voice in my head saying, “You get what you paid for.” Yep. The frame, wheels, tub, and above all the two most critical parts -- the mechanism to adjust the volume, and the gearing mechanism -- are pro or farm grade construction. See the product image showing the cast metal gears; the gear housing even has a nipple to add grease. That seems like a small thing, but it's not. It an indication of quality engineering and design to last, not "planned obsolescence" as with so many throw-away products these days. Quite conveniently, it was nearly all assembled out of the box, also unlike the Agri-Fab. With the Chapin, I only had to assemble the tow assembly. It took 20 min. A customer wrote a review in April, 2023 complaining about the assembly difficulty. That certainly wasn’t my experience. A photo from a different reviewer, Doug, from June 5, 2019, shows how few parts there are to put together. If someone can’t figure that out, they probably have difficulty installing a light bulb. I agree with the rest of Doug's review too. Even the bolts and little parts come neatly packaged and labeled, not jumbled willy-nilly in a plastic bag, as his picture shows. I’ve used it twice on a 5000 sq ft lawn area and it works perfectly. When you stop, the flow of material automatically stops. To be sure, you have to get off to make adjustments to the flow if needed. And you have to set it to zero if you want to drive without material being spread. But I’m OK with that. The Agri-Fab does allow one to remain seated and try (TRY!) to make adjustments, but the Agri-Fab’s control mechanism is such a cheap piece of junk that doesn't work as intended. You can see how cheap the Agri-Fab is just from looking it after buying. It isn’t worth it. The Chapin also comes with a cover for the tub (nice!) AND notice the shape of the tub itself. Another example of clever attention to engineering detail. It’s not rectangular; it has a pointed middle so that you can just tip it over forwards and pour out any remaining content into a box or bag. Love It. YOU GET WHAT YOU PAY FOR!