I have two Barreto tillers. Bought them both in the last couple years. They are all hydraulic machines. The big 1320 has 13 HP, it is simply a superb machine and I've used the best, the old Howard Gems. I had several tillers for the farm, all Gems. They had 9-18 HP, various engines including Hatz diesel, twin Wisconsins, and the oil sump-less British Junior engine. The Junior was a dry sump engine and had simply vast torque. An amazing and fabulous machine. The big twin Wisconsin powered brute weighed 850 pounds and would eat up a pasture the first trip through. Of course, it would eat the operator up pretty fast. It was a man killer. But, what a machine. If my stomach muscles hadn't turned to swamp mud, I'd still be using one now. The big Barreto weighs 540 and no wind will blow it out of your hands. The hydraulic mechanism of the Barreto machine dampens the shock when you hit a stone/rock. They are fabulous machines and if you are of reasonable age, they will last forever and repay your investment right quick over the next 30 years. Parts are generic,not specific to Barreto. You can replace parts easily, whether from Barreto or buying something from near by.
I saw a nice Howard Gem recently and wanted to take it home from the owner and put it to good use but my stomach muscles told me otherwise.
I also think the Grilli is a good machine as well as the bigger BCS units. Neither surpasses Barreto, the Big B is king of the hill.