I've spent about $85 on HappyBidDay and have won about $130 in gift cards. I'm definitely saving money on the site but it takes a bit of time. I'm not working right now so I've got plenty of that!
I usually show in store but the best buy website has a much bigger selection and the same promotions can be found only. If i can't find what i want in-store, i'll often hop online to see what they have.