I had the 585 lost it but no matter as I replaced it with the superior 586 AND 581. I carry the 586 at work and the 581 on weekends. No complaints at all. I butchered a deer this year with the 581 and it is still razor sharp! Gotta love that M390! I love the assisted opening and sometimes think that the de-assist crowd fancy themselves as the true aficionados and they may be right, but the AO is great if you need a quick one-handed knife that's failsafe.