Proof it Works
There are a number of ways you can check this out for yourself, I'll just give you some links here and you can do your own homework......
Exceem is a great resource for finding out all about the business of getting freebies in this way. There are over 16000 members. I've included a live link below to the 'I got my free item' section in the exceem forum.
http://www.reviewcentre.com/reviews146951.html
Well known review site with user reviews about freebiejeebies.co.uk
This is a report by the BBC's Tom Carver on Newsnight
A few other reputable sources:
I recently had this 27" iMac delivered after a few months of doing referrals.....

February has been a good month! I just got this EYETV diversity TV tuner for the above iMac, worth about £90.....

Convinced? Great - go ahead and sign up and let the freebies start rolling in!

