Grinding' the stumps

Spent the day grinding stumps. Rented a Vermeer SC90 stump grinder from Home Depot for the day. Ground 4 stumps at MEW's and around 10-15 here at home. Worked ok, would have been nice if the wheel diameter was bigger so it would dig deeper without bottoming out on the chain guard. The hearts of the freshly cut cedar trees were pretty hard to grind. It is still quite a workout shoving the machine around during grinding.