Bid Cactus have you ever used it?

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Bid Cactus is a fairly new site on which you can bid on things like computer monitors, gift cards, etc. Unlike ebay however you have to pay 75 cents just for bidding! I have yet to buy a bid pak but I see a number of desirable items going off for pennies on the dollar, which makes me want to buy a bid pack. So I was wondering if anyone here has ever used bid cactus and if so what was your experience with it? What did you buy, how much did it cost? Did you run out of bids and thus lose out on an item? Did you win an item? Were there any hidden costs?