Hi there -
I have friends that used RealtyTrac years ago so they may have improved, but they ALL were truly disappointed with their services. Big promises, "easy", etc turned out to be more marketing less action.
Also, if you are looking at buying a foreclosure, look into financing first! If buying via court steps (where they are typically sold) many Counties require cash only. Also, know you are going up against people that do this as their full time job, work for corporations etc. It sounds great - but go to a few and see what it is like first.
Hope this helps!