I don't get why everyone wants to compare this with Ony neck. They are different. Ony neck has stamina, and fire resistance. It CLEARLY will give you less overall dmg than this, if you are a rogue, no matter what your build is.

It makes more sense to compare with Nefarian's neckpiece, which also has no stam and resists. Prestor's Talisman of Connivery is 30 agility and 1% hit. That's 30 AP, 1 crit, and 1 hit for a rogue. So this has 10 more AP, and 1 less hit. Which is better? If you are a rogue it probably depends on your build. For a combat rogue with 5% hit from talents already, this is probably the best dps neck in the game.

Ony's neck for a rogue has a rather sad 12 AP. .4% crit and 1% hit compared to the 28 extra AP on this; Eye of Hakkar wins for damage output. But depending on the situation, you may prefer the stamina and fire res from Ony's Pendant.

or do what I did and get both :)

Hunters get 2 ranged AP per agi, so Amulet of the Darkmoon (19agi/10str/10sta) is almost as good (less crit, but only 2AP less and +100hp!).