havent been on since the cata release, are shadowfangs still around or have they been GF'ed?
if still around im looking to buy 2 for my rogue for 100% bis, willing to do realm hop/faction change
they still drop, they have been showing up in AHs all over because of the expansion rolling new players thru low level dungeons
before u spend $$ and gold....if you haven't played in a while and don't know what is going on in the bracket class/balance/changes brought in MOP, you should just roll your rogue into the BGs with BOA weapons.
since you last played...rogues no longer have sprint, shadowstep, backstab, gouge, and some of the passive bonuses from old talent are gone too
its dependent u can get higher yellows with kris on hemos evis and ambush which is good if youre not getting a lot of ToT, otherwise fangs pyrium and slice and dice is the way 2 go
edit: in a burst orientated setting with low ToT, which is what this xpac is to rogues, dagger is sometimes the better option