I haven't run a 585 or a 592 yet. I have a ported 390. But honestly between the 572 Steve built me, and my 500i. Everything else collects dust. Those two saw are doing almost everything I need, and I mean everything from general all around tree work, firewood and stumping trees and cutting stumps. I threw the 50inch Cannon on my 2101, and I'm going to buy a 42inch to fill a gap, and that will be on my 394 probably. But my 390, 394 and 2101 all collect dust now. You just can't beat the power and weight of the 572 and 500i. The 390 is still handy and not super heavy, but the capability of a ported 572 is incredible, as the 500i mines stock. And I love 461s too. I don't know any production fallers that are really running anything more around here much. It's all 500i, 461s, and 572s. They are getting them ported. But you only run into occasional 661s, or 395s.rarely. tree work around here I see a mix bit many 500is 461s and 572s yet again. I don't want to pack anything heavier anymore.