My bear tank started 80 with the Eviscerator set, which helped him to not die instantly but still didn't get me very far into heroics (not just one toon's gear's fault of course). Now I'm running him with my heroic-geared warlocks and priest through normal ToC, getting the roguey pieces from there. Even the ones with armor penetration are huge upgrades in +agi and +sta. Each run contains a wipe or two when I remember that Growl != Hand of Reckoning and Swipe != Consecrate, but it'll be worth it for the Black Knight's tanking trinket and whatever else I haven't grabbed yet.