I am a fairly regular user of Travelocity's farewatcher system that monitors city pairs and sends you an email when prices change by more than $25 or go above or below a set $$ amount.

The majority of times though, when I follow up on one of their alerts I find that the low fare does not apply to the dates that I wanted to travel.

Are there other systems that work well for other FTers? Specifically is there one that allows the user to define a few more criteria such as date's of travel, preferred airline, etc?

Thanks in advance

Lurker