Should I trust PayPal?

I want to buy and sell stuff on eBay, I have a Chase account. Should I trust paypal with my checking bank account? I am not up for any frauds.

I've never used it, but my friends do and have never had a problem. Just once, one friend somehow entered someone else's account.....

I use it and it has been reliable so far. I think it is much safer than trusting checks from people you don't know.