A word of caution, not about hay unrollers, but about the hay unrolled. Last year, I unrolled about 20 bales across my fields. Some hay rolls were excellent quality, but the TX drought and the hay shortages that followed forced me to buy from intermediaries of lesser reputation. This year, my fields are a solid patch of Cockel burrs because I bought weedy hay. So unless your are willing to pay premium from well known sellers in your region, I would stick to hay rings because you'll be unrolling the good and the bad, and usually the weeds grow with a lot more impetus than the grasses.