G'day BB
Maybe...
Rounded edge rollers seems to have been an advertising advantage more than anything.
Flat-edge rollers were how rollers originally appeared and were used from the start -
for over 100 years.
Some companies used 'round edged' rollers to their advantage post war.
On flat lawns it really doesn't make any difference.
The issue may have some credit on soft soils or inclined surfaces.
Rounded-edge rollers are a better design, though, in my view.
Noticeable ridges in laws are more likely a function of mis-allignment.
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Jack
