I play on 2.4.2 Mangos server. This filter works pretty well. The hint is, that it's usable not only for disenchanting...
Well.. it works also for prospecting ore (in jewelcarafting).. or you can open some quest bags with different stuff without losing this bags from your inventory if the filter is ON. Then you make relog... and open these bags again... For example just... bags from daily fishing quests (that can be accepted in Terokkar Forest near the Shat.City) contain some pretty expensive things.. if you have 4-5 of them, you can make 1k gold per 20 min easily... think
Well.. it works also for prospecting ore (in jewelcarafting).. or you can open some quest bags with different stuff without losing this bags from your inventory if the filter is ON. Then you make relog... and open these bags again... For example just... bags from daily fishing quests (that can be accepted in Terokkar Forest near the Shat.City) contain some pretty expensive things.. if you have 4-5 of them, you can make 1k gold per 20 min easily... think