To complain would be the protruding axes: making only thin rubber cap over it brings almost zero protection. A thread for cap nuts or thicker plastic fuses would be better standing of the roller. And the stripper has come to light, in my opinion; when moist crumbs of the roll adhere, he brings not much. So rollers only superficially sufficiently dry soil ...
Overall, the lawn roller is useful, good and priced interesting tool. More precision and stability, they do not really need for it-yourselfers and hobby farmers. And for the price you can probably not expect a lot more.