I don't know how many it takes exactly to cap your hate, but a good way to determine your hate without just going and getting yourself blasted by a Tonberry is to go to the Tonberry NPC that would reset your hate and just see how much he's charging you to get your hate reset (but make sure not to actually reset it). If it costs you 6,000 gil to reset, then you have a sufficient amount.
You can get hate from any Tonberry, but it has to be a Tonberry. The offshoot species, the Cryptonberries, will not give you hate.
It's not a full time piece, but it is fairly solid for both TP purposes and for critical hit weaponskills. Jobs that have access to Ganesha's Mala will use that for TP over Rancor Collar, and for WS people often use something like the elemental gorget and Rancorous Mantle (which works under the same effect as Rancor Collar and will not stack with it crit hit wise). It gives the fTP bonus and Accuracy from the Gorget as well as +17 Attack and +5 Crit Hit Rate, as opposed to less accuracy, a bit more Attack, and some Double Attack.
For TP I use it on War, Mnk, Thf, Bst, Nin, and Blu (Ganesha's Mala for Drk, Sam, and Drg, Empyrean necks for Dnc and Pup).
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