I've bought and sold various rackets through BC. I've never dealt with Freewilly before, so I can't attest either way.
There are a few things people should do when trading products:
1) Sellers should *always* use a signed and tracked parcel. They cost more, but it's worth it. As a seller, you then know if your product has been received. If it's lost/not received, then you can get money back from the courier service.
2) Buyers should *never* use the friends and family paypal option unless they're friends or family. It is much easier to get your money back if it's listed as part of a transaction for goods and services. The people I have used the friends and family option are people I have traded with several times over.
3) Buyers should *always* clarify any details they want to know about the product. This means getting multiple pictures of what you're buying, confirming it's genuine, and then checking finer details.
4) If a racket hasn't been dispatched within 2 weeks, GET YOUR MONEY BACK. There is a window of opportunity to reclaim money for goods not sent. People aren't perfect and some are working, but 2 weeks is a very reasonable time frame to get something posted. If they haven't posted within that time period, it's a red flag, and a sign you should get that money back.
5) To both sellers and buyers: get the tracking number. As a buyer, it tells you the product is on its way. As a seller, it gives you piece of mind that the buyer has received the product and shouldn't dispute the transaction. EDIT: When I send rackets, I send a picture of the tracking number. I don't just tell them what it is, I show them the label or receipt. This is a solid way of proving the goods are being sent correctly, as it usually includes the address.
This is common sense internet purchasing. I know people are calling for a reputation system, but the truth is, if you take the reasonable precautionary steps to protecting your sales or purchases, it's not really necessary. I can't understand why anyone would bother trying to commit mail fraud anymore given the extent of protection available. Use that protection!