I'm on a lot and I 10 box mostly pvp. I do LFR solo on my priest. Nothing so far as heroics. Really the only reason to go above 3 is world pvp it seems.
Im 10 boxing too and am thinking about dropping down to five more often to run randoms and stuff. keeps the 10 maintained for AV and wpvp but more down to 5 or 4 to run randoms or arena
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