SawTroll
Information Collector
For stumping it's pretty hard to beat the 395XP. They don't have the snappy rev and chain speed of the 660 but they have the torque.
I ran a stock rebuilt 395 and a BB660 head to head and the 395 had the edge every time with a 36" bar and new, off-the-roll 36RSLK.
RSLK for stumping?