Well, it is better than the one you have at moment, so yes it is worth the cost but if I were you I would try and farm this one instead: http://www.wowhead.com/item=81268 , and maybe buy the shoulders from VP instead.
If you are lucky you will get http://www.wowhead.com/item=86802 next time you do LFR and then you already have what I consider to be the two best trinkets that you can get in LFR.