Note sure if this event even still exists, but i found the thread so i'm posting anyway.
IMO these would be best put to use by a warrior weilding a GSoT for the 2hb mod while tanking. With a 250 cap on 2hb +10% would bring you to a grand total of 275, then adding triple attack AA's you've got some very decent DPS along with massive aggro from the proc and less riposte dmg due to the lower delay.
The only thing that would turn me away from this item would be the 31% haste and mediocre stats. That would drive the bidding up WAY too high for it to be really worthwhile, and considering 90% of the guilds capable of this event are likely farming 41% haste items that have decent stats, I'd probably opt to save those points for Xanamech's choker or similar. However, if you're a warrior in a DKP guild, good choice of loot if you think you're probably gonna get out bid on the Breastplate.
Wisdom of the ages or useless ramblings, your choice.