I've experienced a few. Only won once or twice (i believe). Its tough to win them because PayPal always sides with the buyer when it comes to digital purchases.
The best way to reduce the BS associated with it is when your sales start coming in, try and reach out to your buyer. This isn't all bad tho as it will also work out to your advantage as you will be able to start building up a solid mailing list of cats who you've talked to who are into buying your beats.