Have anyone ever used StubHub before? Is it worth it?

On TV and on ESPN the radio I always hear about buying tickets on StubHub because it is cheaper than actually buying them somewhere else (the stadium, other websites etc). Is there anyone who actually did business with stubhub? Is the price actually cheaper than actually buying somewhere else? When I go on the website, the prices look just as high as it is anywhere else. I was looking towards getting some LSU football tickets, Bama Tide tickets, and New Orleans Saints tickets and want to find somewhere where I can find the cheapest tickets possible. Are there any websites or places you know of where I can find cheaper tickets?