I have used this sniping program for a few weeks now, and it works perfectly on my Mac. I also love that it allows me to change my mind on bids, because it bids in the last few seconds, so I can back out of an auction without a problem. The interface is easy to use, it shows pictures, descriptions, and the upcoming bids, and I have had no problems with it. Most sniping programs won't work with a Mac, so this is a great product. Your computer does not have to be on to use it, either. I have won every auction I bid on with the help of this program!