I've been really happy with my Obsidian 9 on everything from 300 BO, my B&T APC9K Pro to pistols. The performance is good though I think the 9K sounds better but I like the fact that the Obsidian 9 breaks down and is user serviceable. I also like the configurable length even thought mine pretty much only gets shot in the short config. Bonus it takes Q's Plan B which is what I am looking into now.