Build quality...or lack thereof.
That's my concern with most of the Chinese made stuff. To design a product well you have to actually use the product to understand what's important and what's not. This is where EA excelled. They actually used and abused their implements and were constantly improving them based on their testing. A lot of Chinese manufacturers simply copy other implements in appearance, and cut corners to lower the cost of their products. So for those buying Chinese made stuff, don't kid yourselves that you're buying an equivalent product for a lot less.
After three summers of heavy use with the Del Morino flail cutting many acres of tall, thick grass and weeds, as well as running over large objects hidden in the vegetation, they're definitely on my short list when I go looking for a larger model. I replaced the sealed bearing on the output shaft of the gear box earlier this summer once it started chirping. The bearing could have been defective, or perhaps I had too much tension on the three belts, time will tell. The bent guard rod was due to my running over large, solid objects such as logs and a block of wood that I didn't see, so I modified the guard system to reduce the need for more repairs in the future. Del Morino would price themselves out of the market if they designed their products for what amounts to abuse, so I don't fault them for the design.
I've used the flail to cut unfamiliar areas for money and when someone is paying you to cut you don't have the luxury of puttering around. There's little chance of my damaging the flail at my place since I'm familiar with what's out there, but some unknown property is a crap shoot and that's why I made a change to the guard.
Before: Guard rod is fixed and in the path of the exit chute which is fine for "normal" use. This damaged occurred when I was cutting a property for money where there was a lot of stuff hidden in the grass. The hammers were fine since it was stuff like logs or tree stumps rather than rocks.
After: Guards and rod hang from another rod that isn't in the path of the exit chute so the added hinge should allow the entire guard to swing up and absorb some or most of the energy.