So everyone wants to know. What's the stronger saw, the MS661 or the 390XP? I made a comparison last year and the 390 was significantly faster. I had opportunity yesterday to run them again. While the 390 still came out ahead, the 661 was much closer this time. Interesting enough, when it came time to flush cut the stump, the 661 was my choice. Bury a 36" bar on both and I think you'd see the 661 pull ahead, although it's hard to say without doing it. Both of these saws are fantastic performers. I'd give the RPM edge to the 390XP and the torque edge to the MS661, although both saws shine in both areas.