My friend did one and they sent her a goach bag....LOL. I almost died laughing when it came.
Just last night our local tv station talked about these offers. They had like 5 of their staff members sit down and try to see how it all worked. They spent over 2 hours looking at offers and other crap and realized that you'd actually have to spend more money on those offers than if you went out and actually bought the item. You get stuck opening credit cards and Blockbuster Total Access accounts or Netflix. All kinds of stuff. There is actually an investigation open in Florida (by the Attorney General, I believe) that is looking into a specific company that runs many of these offers. The news station pretty much said, "Beware"
...not to mention you get SO much junk email and even linking on the "unsubscribe" option never really gets your email account as clean as it once was. I once tried just to see what is actually required and I didnt even finish going through the pages and instead just X'ed out of the explorer window and I STILL got subscribed to junk mail sites!! so infuriating.
about a year ago I did the yourfreedesignerbag one for a free LV manhattan and it was SUCH a PITA. I ended up getting a check for $1500 6 months after the fact, and it cost me about $150 in offers and I have to pay taxes on the check. for a while I thought I was getting nothing.