So, what kind of mower are you running now? Although it really does not matter. What matters is keeping the blades backlapped and adjusted. Also be sure that the guys cross cut and change the patterns of cut every week. Creating grooves in a lawn because the cut pattern is not changed.
Those are the two reasons why I find it better to do my own mowing.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738