I've had two bad experiences with Bob Cassidy's material
I ordered his Mental Masterpieces DVD from a magic dealer on Ebay a while ago, and it never arrived. I asked them about it and they said that they couldn't do anything about it but they "would sell me another one for half price as a gesture of goodwill". I complained and complained, and after weeks I got my money back. I never got the DVD, but have since heard from friends that it's good.
My second bad experience was from Bob's site - he sells Ebooks of his material, and I paid for one of them ($28 through paypal). I closed the window by accident after I had paid, and missed the download link. $28 down the drain. I emailed Bob and explained and asked if he could email me the ebook, but got no response. I emailed again and sent the Paypal receipt but still got no response. Shame, $28 definately down the drain
Sorry about that, I just had to sound off