I had a problem with a set of D'addario ETB92 Nylon Tapewounds. The silks were to long into the nut. I e-mailed them, thinking I wouldn't hear back from them. 15-20 Minutes later I had a response from them. A couple of e-mails with them, and George Santos is going to send me a new set of ETB92's. I didn't mention to him about replacing the strings, I was just letting him know there was a production problem. I recieved the new set in about 5 days, no charge. That's service, and D'addario brand strings are the only strings I use on my basses.