Some good points, John. however, that stump could have barely been done with a craned in 352 (woulda been atight fit to get it positioned if at all possible....and it would have taken lots of digging to get the machine low enough to go 18 inches down...and careful positioning to keep off the sidehill.
I'm not real happy with the AM, but when sharp, it will grind nearly as fast as that 352. And it will do stumps on slopes or other inaccessible areas that can be done with no other machine, even craned in.
Only expense is teeth, a few gallons of fuel, seldom bring a helper.... I don't use it much, but it has more than paid for itself.
There are a slew of guys very happy with their units, do a search here...